What is Film: Definition and 345 Discussions

A film, also called a movie, motion picture or moving picture, is a work of visual art used to simulate experiences that communicate ideas, stories, perceptions, feelings, beauty, or atmosphere through the use of moving images. These images are generally accompanied by sound, and more rarely, other sensory stimulations. The word "cinema", short for cinematography, is often used to refer to filmmaking and the film industry, and to the art form that is the result of it.
The moving images of a film are created by photographing actual scenes with a motion-picture camera, by photographing drawings or miniature models using traditional animation techniques, by means of CGI and computer animation, or by a combination of some or all of these techniques, and other visual effects.
Traditionally, films were recorded onto celluloid film stock through a photochemical process and then shown through a movie projector onto a large screen. Contemporary films are often fully digital through the entire process of production, distribution, and exhibition, while films recorded in a photochemical form traditionally included an analogous optical soundtrack (a graphic recording of the spoken words, music and other sounds that accompany the images which runs along a portion of the film exclusively reserved for it, and is not projected).
Films are cultural artifacts created by specific cultures. They reflect those cultures, and, in turn, affect them. Film is considered to be an important art form, a source of popular entertainment, and a powerful medium for educating—or indoctrinating—citizens. The visual basis of film gives it a universal power of communication. Some films have become popular worldwide attractions through the use of dubbing or subtitles to translate the dialog into other languages.
The individual images that make up a film are called frames. In the projection of traditional celluloid films, a rotating shutter causes intervals of darkness as each frame, in turn, is moved into position to be projected, but the viewer does not notice the interruptions because of an effect known as persistence of vision, whereby the eye retains a visual image for a fraction of a second after its source disappears. The perception of motion is partly due to a psychological effect called the phi phenomenon.
The name "film" originates from the fact that photographic film (also called film stock) has historically been the medium for recording and displaying motion pictures. Many other terms exist for an individual motion-picture, including picture, picture show, moving picture, photoplay, and flick. The most common term in the United States is movie, while in Europe film is preferred. Common terms for the field in general include the big screen, the silver screen, the movies, and cinema; the last of these is commonly used, as an overarching term, in scholarly texts and critical essays. In early years, the word sheet was sometimes used instead of screen. 'Film' in general is not a good term to refer to a long standard commercial video production since it’s ambiguous in general and therefore requires context for correct interpretation.

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  1. R

    Software to estimate n, k Values of a thin film

    Hi! I have samples of multiple thin films. Thin film of which refractive index needs to be estimated is sandwiched between substrate and capping layer of known refractive indices and extinction co-efficients. I have transmission and reflection spectra of the samples and with the help of these...
  2. R

    What Color Will a 320nm Soap Film Appear in Reflected Light?

    Interference with thin film :( Homework Statement A soap film in air is 320nm. thick. If it is illuminated with white light at normal incidence, what colour will it appear to be in reflected light (assume that the index of the soap film is 1.33). Homework Equations The condition for...
  3. A

    Solve the Chaplin Film Mystery on YouTube

    http://www.youtube.com/watch?v=Y6a4T2tJaSU&feature=player_embedded Just for fun, more than anything. But you got to admit, it is intriguing, particularly if you watch the scene more than a couple of times. It does seem that she (he ?) is talking into a cell phone .. in 1928. And no, I am...
  4. M

    What do these variables represent in an equation for thin film reflectivity?

    Homework Statement I'm just trying to figure out what all the variables are in an equation I'm using for thin film reflectivity. Any advice beyond that would be appreciated though...Homework Equations rthin slab=(-i * \lambda * \rho * r0 * \Delta)/(sin(\alpha)) note: alpha here isn't an...
  5. turbo

    Princess Bride: Inconceivable! A Classic Film

    Could Hurkyl do Princess Bride? "Inconceivable!" "I don't think that word means what you think it does." Good film.
  6. Q

    Thin film of oil interference

    Problem A thin film of oil (n = 1.30) is located on a smooth, wet pavement. When viewed perpendicular to the pavement, the film reflects most strongly red light at 640 nm and reflects no light at 548 nm. How thick is the oil film? Equations and Attempt Refractive index: air - 1 oil -...
  7. F

    Some favorite pieces of art, film, etc.

    Just off the top of my head: I'm rather partial to this portrait of Napoleon... [PLAIN]http://www.nmm.ac.uk/tserver.php?f=NAN0120.jpg&h=650&legacyResize Somehow, I just don't think I could ever execute red velor pants as well (really more of a blue jeans or brown slacks kind of guy)...
  8. P

    Thin Film Problem: Find Minimum Thickness for Light Transmission

    Homework Statement A glass (Refractive index 1.33) is coated with a thin film. (Refractive index 1.50) Find the minimum thickness of the film, if the glass is to transmit light of wavelength λ. Homework Equations The Attempt at a Solution Light reflected from the upper surface of...
  9. I

    XRD/XRR v. AFM for Film Thickness

    Currently in our lab we have a WEDGE shaped sample that we would like to be able to know the thickness at various points along it. Our sample is about 5mm x 5mm. The wedge SHOULD extend from one side to the other. At the highest point, the wedge is 50nm, and then drops down, hopefully at a...
  10. S

    Witness the Beauty of the Universe: IMAX Hubble Film

    I saw the IMAX Hubble film today. Whewww, It was absolutely beautiful! A must see for anyone who likes things.
  11. C

    InVisage: Quantum Film - real of fake?

    InVisage: "Quantum Film" - real of fake? First a link: http://www.invisageinc.com/page.aspx?cont=QuantumFilm%20Technology" . (Company's website page for it; used for their wording on the claims.) Then another: http://www.google.com/search?q=quantum+film". (Google Web Search for Quantum Film...
  12. P

    Optics: Soap Film and Other Things

    I understand the idea behind the optical interference that produces colors on thin films but have never figured out the reason that the films have to by 'thin'. What is the lack of similarity that I am missing between a film and a somewhat thick sheet of glass or something that makes these...
  13. K

    Evaporation in a silicon film

    Hai.. I have a problem with my heat transfer coefficient estimation during my evaporation measurements. Here is the problem: Two scenarios are compared. Case 1: I have a well defined rectangular area in a silicon wafer. Water is completely spread over it. The mass of water is known. Air is...
  14. T

    Thin film interference problem

    Hi, I'm a high school physics student and I'm having a lot of trouble with thin film interference Homework Statement A thin layer of oil (noil=1.25) is floating on water (n=1.33). How thick is the oil in the region that strongly reflects green light (λ=556nm)? Homework Equations noil/nwater...
  15. D

    Thin Film Processing Interfaces: Info & Resources

    I need to write up some stuff with general information about different interfaces used in Thin Film Processing. I'm pretty sure its a way to analyze the quality of the different procedures. * Abrupt Interface * Mechanical Interface * Graded Interface * Compound Interface * Psuedo...
  16. X

    How Does High Voltage Affect the Charging of Mylar Film?

    Hi, I was studying the effect of high voltage on the properties of Mylar film. The voltage input can be both DC (around several hundred volts to 1000V) and AC (same level as DC). The Mylar film is very thin, 6um, I know the film is going to be charged, but I don't know 1. how fast the film...
  17. J

    Interference due to a thin film

    Homework Statement A thin film with a refractive index of n=1.50 is surrounded by air. Wavelengths of light 360, 450, and 602 nm are the only visible wavelengths missing from the reflected light. What is the thickness of the film. Homework Equations The Attempt at a Solution One...
  18. F

    Band bending in a thin film semiconductor

    Hello! There're very thin (4-15 nm) semiconductor films (passive film) formed on stainless steel by electrochemical method. In a electrochemical cell, I applied potential on stainless steel electrode to adjust Fermi level of the semiconductor passive film. I think that band bending take place...
  19. F

    How to know phase difference will be of a light wave entering a thin film?

    For instance, I know if a light wave traveling air (n = 1) enters a thin film of water (n = 1.33), there will be a phase difference. My textbook sol'n manual states that there will be a 180 degree phase difference for a wave of light that reflects of the top of the air-water boundary, but NO...
  20. P

    Thin film intereference basic question

    This is not a homework problem but a general problem I've been having when studying for physics. What is the formula for "thickness" for thin film interference problems? I read somewhere that there are a variety of equations that can be used--depending on interferences, and etc--however, I...
  21. N

    Thin film asymmetrical grazing angle XRD

    Hi guys I wanted to know if somebody can guide me on how to run a symmetrical grazing angle XRD on carbon thin films. I have been doing asymmetric grazing angle which predominantely measures diffraction pattern which is out of plane (normal) to the substrate. Now, I want to do an in-plane...
  22. B

    Time Dilation/Gravitational Theories Needed for Short Film

    Hi Everyone, I hope everyone had a very enjoyable holiday season. Currently I'm developing a short film to shoot later this year. Being ever fascinated with the natural universe and also theoretical physics this film will be a welcome new approach to the science fiction genre. The goal is...
  23. T

    How Is Film Thickness Calculated from Interference Patterns?

    Homework Statement Light of wavelength \lambda = 500nm, produced by an extended source, is incident at an angle of \phi= 30 degrees from the normal upon a dielectric film of refractive index, n=2, supported on a solid planar substrate. Reflectivity minima are observed to have an angular...
  24. DaveC426913

    NZ film on Space Channel called Black Sheep

    I am watching a truly awesome NZ film on Space Channel called Black Sheep. "An experiment in genetic engineering turns harmless sheep into blood-thirsty killers that terrorize a sprawling New Zealand farm." Byline: Get ready for the Violence of the Lambs!
  25. M

    How Can Thin Film Interference Cause Complete Destructive Interference?

    I've learned that when a wave is partially transmitted and partially reflected, it loses some of it's amplitude in order to conserve energy. How then, in thin film interference, can one wave produce complete destructive interference with the other if it has been partially transmitted? Wouldn't...
  26. TheStatutoryApe

    Annoying Stereotypes and Devices in TV, Film, and Writing

    I think the title is pretty well says it. What are the stereotypes and story devices used in fiction of any variety including film, television, writing, ect that you find to be annoying? I have been watching the first season of the show Fringe and it has reminded me of just how much screams...
  27. P

    Thin Film Interference and reflection

    Homework Statement What is the thinnest film of a coating with n = 1.43 on glass (n=1.52) for which destructive interference of the red component (660 nm) of an incident white light beam in air can take place by reflection? Homework Equations 2t = m*lambda? The Attempt at a...
  28. P

    How long do metal and carbon film resistors last?

    Hello, I've read that metal film resistors are better than carbon film because they're resistance remains constant even when they heat up from being soldered. And I know they're suppose to be more precise with a 1% variance instead of 5% of the carbon films. I know capacitors go bad - do...
  29. G

    How to Improve the Smoothness of Thin Film Samples?

    1. The problem statement: A wavelength (λ)550 nm light ray traveling thru a viscous medium n1= 1.46 strikes a a crystal n3=1.5 protected by a film n2=1.25. [b]2. Relevant equation: How can I determine the min thickness of the antireflective coating used to minimize the reflection of...
  30. N

    Thin Film Laboratory resources

    Friends,seeking some doctoral Researchers in the sub-domain of thin-films,I would want the following assistance from any of them: (1)A Standard Reference Book that addresses introductory (Post Grad.) and advanced (PhD) topics in thin Films.(2) Some standard Lab projects that has been...
  31. S

    Why did the bike rotate in the physics experiment in the film 187?

    In the beginning scene of the film One Eight Seven, Samuel Jackson's character has one of his students hold a bicycle while sitting in a chair, and pump the pedals until the wheel got up to around 180 rpm. When he told the student to tilt the bike to the right, the chair started rotating...
  32. S

    Soap film having index of refraction

    What is the minimum (non-zero) thickness of a soap film having index of refraction 1.46, with air on both sides, that transmits virtually 100% of 500 nm light incident along the normal? a. 345 nm. b. 86 nm. c. Any thickness transmits 100%. d. 172 nm. I used...
  33. L

    Finding (1) wavelength, and (2) thickness of film for constructive interference

    1) In a double-slit experiment, two parallel slits are illuminated first by light of wavelength 460nm, and then by light of unknown wavelength. The third-order (m = 3) dark fringe resulting from the known wavelength of light falls in the same place on the screen as the second-order (m = 2)...
  34. C

    Thin Film Interference in a Soap Bubble

    Homework Statement Question: A soap bubble of index of refraction 1.48 strongly reflects both the red and the green components of white light. What film thickness allows this to happen? (In air, the wavelength of red light is 716 nm, of green light 511.429 nm.) n = 1.48 \lambda(r) =...
  35. K

    Hall Effect Measurement: Thin Film Thickness Effects |

    when doing hall effect measurement, will the thicknes of thin film affect the result?what is the best thickness to do the measurement?
  36. K

    Thickness of thin film not affect electrical properties?

    In deposition of thin film on a p-type silicon, how to make sure the thickness of the thin film will not affect or affect the least the electrical(Hall Effect) and structural properties? how to know how thick is the thin film that most suitable? can it be calculated? by the way, the thin film...
  37. DaveC426913

    The Last Good Sci-fi Film Ever Made

    I just saw the trailer for 2012. I was astonished to find myself almost looking forward to it. I think I know why - I think I finally realized that a tiny little piece of me - the piece that hoped for years beyond hope that there will ever be a well-done actual science fiction movie released...
  38. T

    Forgotten Film: Fireman & Wealthy Widow Reunite

    Forgotten the name of the film. It's about a fireman who meets a very wealthy widow and they fall in love. But then things go bad. But the ending was that they reunited again with the help of the widow's daughter whom called the fireman for some small problem with the toaster. The guy looked a...
  39. G

    Food Inc. most important film I have seen in a while

    Definitely a must see. This movie was shocking. Some of the things food companies are getting away with and how they are able to write our laws is incredible. If you care about your health and what you eat, definitely see this film.
  40. P

    Thin Film Interference: How does Maxwell's Equations Explain?

    Not really a homework problem. Just wanted to know: When light moves from a medium of lower index of refraction to that of a higher index of refraction, the reflected ray suffers a phase change. (Thin film interference) But the other way round, this doesn't happen. This can be shown by...
  41. V

    Thinnest film in which the reflected light will be a maximum?

    Homework Statement Monochromatic light, at normal incidence, strikes a thin film in air. If (lambda) denotes the wavelength in the film, what is the thinnest film in which he reflected light will be a maximum? Homework Equations 2d = (m+1/2)(lambda/nfilm) for minimal reflection and 2d =...
  42. L

    How to find out the effective cross area of a molecule in a monolayer film?

    hi guys, i need some help with the following questions relating to cross sectional area. thanks in advance! 1) when n-hexatriacontanoic acid, CH3(CH2)34COOH was placed in water, a complete monomolecular film was formed. if the length of a carbon-carbon single bond in the chain is 1.54...
  43. L

    How to find out the effective cross area of a molecule in a monolayer film?

    hi guys, i need some help with the following questions relating to cross sectional area. thanks in advance! 1) when n-hexatriacontanoic acid, CH3(CH2)34COOH was placed in water, a complete monomolecular film was formed. if the length of a carbon-carbon single bond in the chain is 1.54...
  44. H

    Thickness of Film:Constructive Interference @ 547nm, n=1.31

    Homework Statement Light of wavelength 547nm is incident perpendicularly on a soap film (n=1.31) suspended in air. What is the smallest nonzero film thickness for which reflected light undergoes constructive interference?Homework Equations 2t = (m + 1/2)(wavelength/nfilm)The Attempt at a...
  45. Q

    Stern-Gerlach Separation Distance on Target Film

    I have a question in which we are instructed to find the separation distance between the two impact zones of Sodium atoms on a photographic plate: A magnet of length l= 0.15m and field gradient \nablaB= 9.0T/m over its full length is used in a Stern-Gerlach experiment. If a beam of Sodium...
  46. I

    Thin film light interference question

    Homework Statement A uniform film of oil (n=1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a maximum at wavelength (lambda) = 450nm and a minimum at wavelength (lambda) = 600nm. What is the thickness of the...
  47. P

    Distance between lense and film to get a focused picture

    Homework Statement Esperanza uses a 35-mm camera with a standard lens of focal length 50.0 mm to take a photo of her son Carlos, who is 1.3 m tall and standing 4.0 m away. What must be the distance between the lens and the film to get a properly focused picture? this answer is 50.6 mm...
  48. M

    Find Thickness of Oil Film on Water, \lambda = 550 nm

    Homework Statement A thin film of oil (n = 1.50) floats on water (n = 1.33). If the film appears yellow-green (\lambda = 550 nm) when viewed at normal incidence, how thick is it? Given: n_{f} = 1.50 n_{water} = 1.33 \lambda_{0} = 550 nm \theta_{i} = 0 Required: Thickness (d)...
  49. U

    Technique to detect thin metal film break?

    The thin metal film is scored with some pattern to 50-80% of its thickness. When exerted shear stress, the film will crack/open at score. I wonder what simple/practical techniques can be used to detect its pinhole or opening in real time?
  50. A

    How Does Angle of Incidence Affect Color Reflection in Soap Films?

    A thin soap film (n=1.318) suspended in air has a uniform thickness. When white light strikes the film at normal incidence, violet light (412 nm) is constructively reflected. At what angle of incidence will green light (564 nm) be most strongly reflected? Assume that the film as the minimum...
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