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. D

    Calculating Average Force on Proton in Metal Film

    A proton (m=1.67x10^-27 kg) that has a speed of 5.0x10^6 m/s passes through a metal film of thickness 0.010mm and emerges with a speed of 2.0x10^6 m/s. How large an average force opposed its motion through the film?? can anybody give me a clue on where i can start?
  2. X

    Optics and thin film interference question.

    Homework Statement The thin film is of two glass with air in the middle. refractive index of... air: n=1.0003 glass: n=1.5 lamba=632.8nm Q1.) Calculate optimum thickness of the film (for 1st order interference) Q2.) Why does the distance between interference fringe beome longer...
  3. S

    Destructive Interference of Light in 165nm Bubble Film

    Homework Statement Light waves of which wavelength will destructively interfere due to the thickness of the bubble film? The bubble film thickness is 165 nm, with an index of refraction of n = 1.3. a= 430 nm b= 650 nm c= 860 nm d= 285 nm (different wavelengths) Homework Equations...
  4. C

    Double slit and thin film interference

    While completing my problem set for this chapter, I came across 5 problems I could not solve. I thought it might be rather annoying if I posted six posts, so I'm putting all my work and such here. I don't expect one person to try to help me with all of them, just one or two at a time will do...
  5. S

    Film interference with light and refration

    ok so i know why this happens but I am just not sure how to see how thick the film would be, I am not sure if your supposed to use the equation dsin(-)=wavelength someone help please thanks! You are outside in the Sun blowing bubbles. As you raise the round wand to blow bubbles, you notice an...
  6. S

    Optimizing Thin Film Interference for Maximum Reflection

    Homework Statement A transparent oil with an index of refraction of 1.25 spills on the surface of the water (n=1.33), producing a maximum of reflection with incident orange light (\lambda = 602nm in air.) Determine the lowest possible thickness (in nm) of the oil slick.Homework Equations...
  7. N

    Thin Film Interference Help?

    I don't have a particular homework inquiry to ask, just some questions I have about thin-film interference and its related equations. I was told by my instructor to learn these concepts on my own and I am just having a few problems I want to clarify. 1) Equations related to thin-film...
  8. M

    Wiring Thin film solar panels into a circuit

    Hello, I'm currently doing a project which involves generating power from thin film solar panels, I have found the kind I need on a site (http://www.siliconsolar.com/flexible-solar-panels-6v-p-16205.html) which suits my size and power criteria but I am not totally sure how I would go about...
  9. jtbell

    Goodbye Polaroid Film: Physics Labs Say Farewell

    Fans bid farewell to Polaroid film I've never owned a Polaroid camera myself, but I've used them in introductory physics labs. When I was a grad student, and in my first teaching job, we used them with a strobe lamp to photograph two-dimensional trajectories for projectile motion. Students...
  10. C

    What Is the Longest Wavelength Enhanced in a Thin Soap Film?

    Homework Statement A soap film is 129 nm thick. The film is in air and illuminated by white light at normal incidence as shown in the figure below. (In the figure the rays have been drawn at an angle to show the multiple reflections and transmissions in the film.) Assume the index of...
  11. D

    Thin Film Interference formula

    Hi everyone! Here's the problem related to thin film interference. I mean, it's not quite a problem. I've been looking for the formulae related to this type of interference and fount two different things in two different textbooks. It's the formula for the optical difference of the wave...
  12. Ivan Seeking

    The Mysterious Cough, Caught on Film

    story http://www.nytimes.com/2008/10/28/science/28cough.html Slide show of more interesting shots http://www.nytimes.com/slideshow/2008/10/27/science/102808-Cough_index.html
  13. M

    COMSOL for thin film heterostructures

    I am trying to model intrinsic stress of some thin film heterostructures. As I am not a modeler but an experimentalist/processor by trade, I would prefer to minimize the amount of time I spend banging my head against the wall trying to find out if this software is appropriate. So, my question...
  14. F

    Light - Thin Film interference

    Homework Statement A thin film of MgF2 with n = 1.38 coats a piece of glass. Constructive interference is observed for the reflection of light with wavelengths of 500 nm and 625 nm. Part A - What is the thinnest film for which this can occur? Homework Equations t = lambda/2n *(m + .5)...
  15. O

    Slacker uprising - new Moore film

    Movie is available for online viewing: https://www.amazon.com/gp/product/B001GIYC4K/?tag=pfamazon01-20 or for download at: http://slackeruprising.hypernia.com/SlackerUprising_640x360.avi (unfortunately this is down now) or bittorrent...
  16. M

    Reflection of light off film, wavelength and thickness?

    What is the thinnest film of MgF2 (n = 1.39) on glass that produces a strong reflection for light with a wavelength of 680 nm? This is the exact question I am faced with. I didn't really know where to begin so I tried using the ratio of n-air/wavelength to n-film/(new wavelength) to try and...
  17. H

    Calculating the Longest Visible Wavelength for Thin Film Interference

    Homework Statement An oil film (index of refraction no = 1.48) floating on water (index of refraction nw = 1.33) is illuminated from above by white light at normal incidence. The film is 360.0 nm thick. What is the longest visible wavelength that will be strongly reflected? What is...
  18. G

    Senior Year Course Choices for Engineering: IB Film Studies?

    Hey, I'm going into my senior year of high school and am applying to some prestigious engineering schools namely berkeley =/ and am concerned about my senior year schedule. it is as follows: IB English II IB Spanish 6 IB European History II IB Physics II TOK/ ? (Maybe law or some history...
  19. C

    Minimum thickness of thin film constructive interference

    Homework Statement What is the minimum (non-zero) thickness of a benzene (n = 1.501) thin film that will result in constructive interference when viewed at normal incidence and illuminated with orange light (lamba = 615 nm)? A glass slide (ng = 1.620) supports the thin film answer= 204 nm...
  20. L

    Thin Film Interference: Finding m Value

    For thin film interference, I was wondering how you know what the value of m is for the equations: 2nt/λ=m (destructive) 2nt/λ -1/2=m (constructive)
  21. U

    Question regarding thin film interference

    My question concerns thin films of varying thickness. I have a basic understanding of thin film interference, and understand the effects of thickness on wavelength, and that with increasing thickness color fringes will be evident. I understand that the color fringes come from: n*t = m*\lambda...
  22. A

    Red Light in Darkrooms: Benefits for Photographic Film

    Why is it that red light can be used in darkrooms when developing film? What is so special about it that it doesn't damage photographic film? I figure red light high wavelength, thus less intensity?
  23. R

    Making a transmission more efficient: film strength versus thickness

    What is the relationship (generally speaking) between film strength, film thickness, and viscosity: If I polish / superfinish the gear teeth, and bearings on trans, can I go with a lighter viscosity oil, to improve the efficiency of a manual transmission, while still keeping reasonable safety...
  24. S

    The puzzling discovery of a motor made from liquid film

    Here’s an interesting effect discovered by a group of Iranian physicists at Sharif University of Technology in Tehran, Iran (it’s not often we hear from these guys). They placed a thin film of water in a square cell and applied two perpendicular electric fields. One was an external electric...
  25. W

    Solving Thin Film Problem: Wavelength in Visible Spectrum

    A camera lens (n = 1.80) is coated with a thin film of magnesium fluoride (n = 1.45) of thickness 80.0 nm. What wavelength in the visible spectrum is most strongly transmitted through the film? I have tried to solve this problem for quite a while now, and i hate to admit that there might be a...
  26. J

    Thin glass film interference

    A thin piece of glass with an index of refraction of n2 = 1.50 is placed on top of a medium that has an index of refraction n3 = 2.00. A beam of light traveling in air (n1 = 1.00) shines perpendicularly down on the glass. The beam contains light of only two colors, blue light with a wavelength...
  27. A

    How Thin Should the Glass Be to Shift the Interference Maxima?

    Homework Statement A pair of slits separated by d = 1.30 mm is illuminated with light of l = 610 nm wavelength and falls on a screen L = 2.00 m away. A piece of glass with index of refraction n = 2.2 is placed at one slit. If the maxima shift is Dx/2, and falls on a minimum, what was the...
  28. A

    Thin film red light green light interference

    Homework Statement A mixture of red light (wavelength vacuum = 652 nm) and green light (wavelength vacuum = 477 nm) shines perpendicularly on a soap film (n = 1.333) that has air on either side. What is the minimum nonzero thickness of the film, so that destructive interference removes the...
  29. S

    How to find how many people seeing only indians film

    Hi all I am facing a bit problem with this query.Can anyone help me out of this?? In film criticis process 62 people seeing US based film, 75 people seeing Indians film, 86 people seeing chinese film, 45 peoples seeing both US and indians film, 34 people seeing both Indians...
  30. B

    I am in need of a formula. (visible wavelength, thin film)

    --------- If anyone could help me out it would be greatly appreciated. 2nt = (m[+.5])\lambda
  31. Andre

    JFK Assassination: Is the Zapruder Film Faked?

    Would the Zapruder film (JFK assassination) be discussable? Not really suitable for minors or? I saw some pretty compelling evidence that it's faked.
  32. S

    Bingham fluid in a falling film

    2) For Bingham fluid in a falling film. \tau0. a) Find the equation for \tauxz as a function of x using a shell balance. b) Solve for the minimum thickness of film that will allow flow of this Bingham fluid using the equation for a Bingham fluid and the correct boundary conditions. c)...
  33. L

    Minimum Thickness of a film with wavelength and index of refraction.

    1. If the index of refraction of you soap was 1.35, calculate the (minimum) thickness of the film at that part of the film that appears green, given that in air, green light has a wavelength of 535 nm. 2. x = L(lambda/2t) 3. I can't figure out how to derive the equation with n...
  34. P

    Warriors Quote: "Come Out to Play

    " Warriors, come out to play..ay...ay..ay!" from the film Warriors - what a man says in order to encourage a gang to beat him to death with baseball bats!
  35. P

    Nanowire and thin film magnetisme

    hi there im searching for an answer about matter magnetism. actualy, i need to know which energies of anisotropy are so different betwen the bulk and a thin-film . then i need to know which energy of anisotropy is so different between a nanowire and a thin-film. 10x for your repply
  36. K

    Dumbo the Kangamouse caught on film

    http://news.bbc.co.uk/1/hi/sci/tech/7130484.stm I saw this on the news this morning and fell instantly in love. And for those wanting it as a pet its quite endangered so the odds are as long as its ears.
  37. S

    Thin Film Interference problem

    Hey guys, I was wondering if someone could explain to me when Thin Film Interference will produce constructive/destructive interference. I think I might understand it, but I'm not 100% sure and I have a test coming up soon. Any help would be great! Ok, so I know we have the equation: 2t =...
  38. E

    Why has the Patterson-Gimlin bigfoot film never been exactly duplicated?

    Why has the Patterson-Gimlin "bigfoot" film never been exactly duplicated? Setting aside the issue of whether it is a hoax or real, why can no one exactly reproduce this film if it is a hoax, using technology present in 1967
  39. J

    What Is the Minimum Thickness for Constructive Interference in a Thin Film?

    A thin film is put on the surface of glass, with indexes of refraction of x and y respectively. If light, with wavelength L in air, is reflected from the 2 sides of the film, to interfere constructively, what is the minimum thickness required. The question is stated just like that, so I...
  40. B

    Thin Film Question: Finding Oil Slick Thickness

    I was having a bit of trouble with this question: A thin oil slick of refractive index 1.3 floats on water. When a beam of white light strikes this thin film vertically, the only colours enhanced in the reflected beam seen in air are orange-red (650nm) and violet (430nm). What is the thickness...
  41. W

    Film Winder Force and Torque Calculations

    This is an actual real-life problem. There is a machine that winds film at my work. I need to determine the torque required (T_2) and force needed (N) for the conditions showed in my diagram when all variables except F_T2 are known. Roll #2 begins with no film and ends as a large roll with...
  42. I

    Is there a solution for protecting a camera from oil-based ink mist?

    Hello, I have a camera I am using to monitor some items, and the shield for it is exposed to a lot of mist (oil-based ink). An issue I am having is that this guard is quickly becoming covered, rendering the camera useless. It is dificult to access the camera, so cleaning it by hand becomes...
  43. H

    Thin Film Reflection: Interference Phenomenon

    I need help with this question: "Name the wave phenomenon that is responsible for the formation of regions of different color when white light is reflected from a thin film floating on water." In my handy-dandy high-school physics book, it says that "The different thickness of the gasoline...
  44. S

    Thin Film Emissive Display Devices: Internal Reflection's Impact

    How internal reflection affect the performance of the thin film emissive display devices?
  45. S

    Flock of Dodos": A Must-See Film on Creationism vs. Evolution

    I thought many who contribute to this glorious forum would appreciate this. Tomorrow night "Flock of Dodos" a deep and gentle look into the whole creationism v. evolution thing premieres on Showtime. I highly recommend not only watching this film, but trying to get as many people as you can...
  46. I

    Optics - Refracting light on film oil

    Hi i was going through some of my physics past papers to prepare for exams, when i came across this question A film of oil of refractive index 1.45 rests on a flat piece of glass of refractive index 1.6. When illuminated by white light at normal incidence, light of wavelengths 690 nm and 460...
  47. L

    Understanding Thin Film Interference and Color Formation in Soap Films

    Consider a soap film where both sides of the film is air. So reflected light has a π phase change. Consider constructive interference, 2 d "nfilm" + 1/2λ = nλ , where "nfilm" is the refractive index of the film and d is the thickness the film. Due to the gravity, the film at the bottom...
  48. F

    Finding thickness of a thin film question

    Homework Statement A thin film of oil (n = 1.23) 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 569 nm. How thick is the oil film? Homework Equations...
  49. Y

    HELP [Confused] Case: Fuji Film Introduces Aps

    HELP! [Confused] Case: Fuji Film Introduces Aps In the early 1990s, Fuji Photo Film, USA, joined forces with four of its rivals to create the Advanced Photo System (APS), which is hailed as the first major development in the film industry since 35 - millimeter technology was introduced. In...
  50. T

    Thin Film Interference (Interferometer)

    Homework Statement One of the beams of an interferometer passes through a small glass container containing a cavity 1.30 cm deep. When a gas is allowed to slowly fill thr container, a total of 236 dark fringes are counted to move past a reference line. The light used has a wavelength of 610...
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