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. M

    Archived Topics / thin film question

    Homework Statement Two rectangular plates (n = 1.60) are in contact along one edge and separated along the opposite edge (see figure). Light with a wavelength of 600 nm is incident perpendicularly onto the top plate. The air between the plates acts as a thin film. Nine dark fringes and eight...
  2. C

    Building a high voltage Film Cap, but its failing across the board

    new to this project and have limited knowledge, but the failure is consistent thru all specimens so I am hoping someone could shed some light. Film cap design is rated to 1650v Failure- Cap initially failed around 800v consistently, the curing time was adjusted and a ramping cycle was...
  3. C

    Wavelengths / film / reflected light

    Homework Statement A film of MgF2 (n = 1.38) having thickness 1.44 x 10-5 cm is used to coat a camera lens. What are the three longest wavelengths that are intensified in the reflected light? (Enter your answers from smallest to largest.) Homework Equations λn = λ/n n = index of...
  4. I

    What's a funny physics invention for making a charlie chaplin film?

    Any physics invention for making a super catchy and funny charlie chaplin film?
  5. E

    Laser pointer shined on photographic film?

    What would happen if I bought highly sensitive photographic film such as ASA 800 and shined a laser pointer on it? When I get it developed will the photons that the laser emitted show up on the film?
  6. J

    Thin Film Interference- Transmission

    Homework Statement A thin layer of water (n=1.33) is surrounded by air what wavelength of light will not be transmitted through the water at the point where the water is 113 nm thick? The Attempt at a Solution - In phase - Path difference of 2T. - Constructive Interference I just...
  7. P

    Why the surface plasmon always use gold or silver as a metal film?

    I found a lot the the surface plasmon on prism geometry are using gold for metal film, and part of it are using silver. Why we need use gold or sivler as a metal film, is it about the condutivity?
  8. W

    Thin film interference concept

    Hello, I am having some difficulties understanding this concept. It seems like wikipedia and my notes/teacher contradict each other According to my equation sheet, the equation for dark spots is 2nt = mλ and for bright spots is 2nt = (m + 0.5)λ. However, if a phase shift of 180 degrees occurs...
  9. P

    Basic question about measurement of thin film by means of spectral reflectance

    Hallo alle users, as the title indicates, I have a question about measurement of thin film thickness by means of spectral reflectance. Given, the to be measured thin film has thickness less than 600 nm, but the measuring light has only wavelengh larger than 600 nm. Does it mean, that the...
  10. M

    Oil film thickness for total reflection 500nm

    Homework Statement I was asked to determin the film thickness for an oil film (n=1.33) for a light beam (500 nm) to give total reflection. I could calculate refraction angle for air to oil, but have no idea as to how to approach this question. Homework Equations The Attempt at a...
  11. D

    Discovering thickness of a thin film.

    Hi guys, long time reader new poster. I am looking for ways to determine the thickness of some thin films of zinc oxide I have been producing. Conventionally I use SEM cross section, but the throughput of films has made this a little taxing. I've tried also weighing the substrates before...
  12. I

    Deducing the film thickness of this ques below:

    a thin soap film is seen in sodium light by normal reflection method it appears totally dark deduce the possible values of film thickness given (myu)-refra.indx of liquid-1.333 and lambda wave.lgth-5893 angstrom
  13. G

    Double-slit diffraction with thin film interference

    Homework Statement A very thin sheet of plastic (n=1.70) covers one slit of a double-slit apparatus illuminated by 630 nm light. The center point on the screen, instead of being a maximum, is dark. What is the (minimum) thickness of the plastic? Homework Equations Constructive...
  14. J

    Thin Film Problem: Find Film Thickness from Reflected Light Wavelengths

    Homework Statement A thin film of alcohol (n=1.36) lies on a flat glass plate (n=1.51). When monochromatic light whose wavelength can be changed, is incident normally, the reflected light is minimum for λ=512 nm and a maximum for λ=640 nm. What is the thickness of the film? Homework...
  15. ezfzx

    Thin Film Interference: The Movie

    I put together this little movie as (hopefully) the first in a series. http://www.youtube.com/watch?v=xjMjWtntm9k" My target audience is a second semester class of physics students that have already had a lectures in basic wave optics. When I give this URL to my students, it's with the...
  16. J

    Mel Gibson film about Judah Maccabee.

    Apparently Mel Gibson is making a movie about the Maccabean revolt around 150 BC. Mel is a Roman Catholic and two books of their Bible are Maccabees 1 and 2. There is a 3 and 4 in the Greek Catholic Bible. None of the books are found in the Jewish and Protestant Bibles, but used to be. The...
  17. C

    Measurement of capacitance of dielectric film using front contants

    Hi, I have deposited a film of dielectric on SiO2 substrate. Then, deposited metal dots on the top of dielectric film to measure electrical properties. I want to measure capacitance using metal dots on the top of dielectric. Since I have SiO2 as a substrate, I can not make a parallel plate...
  18. C

    Measurement of capacitance of dielectric film using front contants

    Hi, I have deposited a film of dielectric on SiO2 substrate. Then, deposited metal dots on the top of dielectric film to measure electrical properties. I want to measure capacitance using metal dots on the top of dielectric. Since I have SiO2 as a substrate, I can not make a parallel...
  19. J

    Being a film producer/playwriter etc

    How much does one earn to be a film producer/playwriter in the US ? Many people seem to run into this industry. I bet if it is less than 10G/film item, they won't work ? Thank you
  20. K

    Geometrical problem related to thin film interference

    Look at the picture below, I have to prove that the optical path length difference is \Delta=n(BC+CD)-BE=2nd\cos(r) [PLAIN]http://img200.imageshack.us/img200/2271/schermata082455775alle1.th.png The problem is just how to get 2nd\cos(r) I actually don't have any idea :\ I have...
  21. K

    Thin film interference formulae

    Hello, I am trying to understand thin film (in air) interference but I have a problem: I know we have destructive interference when \delta=(2m+1)\pi. Now i can try to calculate the thickness of the film to get it, so since \delta =\frac{4nt\pi}{\lambda} - \pi where t is the thickness...
  22. B

    Film source code total rubbish?

    having watched the film source code where they try and persuade that quantum physics allows for the brain to contain infinite parallel worlds i wondered if anyone made sense of it. As far as i could tell it was total rubbish from start to Finnish. Even down to the guy managing to send a text...
  23. M

    Chemical Photoshop for Emulating Film and 100 year old processes

    Autochrome is a photography technique which all details forgotten 50 years ago but counted as the best color photograph technique. There are two layers on glass , one RGB Screen and second , a bw emulsion. When RGB filter separates the image , bw all color sensitive layer records the tones...
  24. K

    What do uniaxial and biaxial mean in relation to piezoelectric film development?

    Ok. I know this may sound like a stupid question but for the life of me i can't find definitions for these terms. I am working on developing a PVDF polymer based piezoelectric film and need to know what the terms Uniaxial and biaxial mean. I am using an electrospining method to make the fibers...
  25. F

    What is the Most Powerful Film Score of All Time?

    In my opinion, the most powerful score from any movie in history would have to be from the "saw" film franchise. Gives you goosebumps if you play it with the sound blasting. Composed by Charlie Clouser.
  26. D

    Need Help finding Conductive Adhesive Film

    I have been repairing some devices but some of them have the pad connection ripped off so I can not repair the USB tips. I have found out how to repair the ripped connection which is the following procedure; Either a conductive liquid or film epoxy is put on the ripped connection area, then the...
  27. C

    Designing a Reddish-Orange Office Tower: Calculating Film Thickness

    Homework Statement A construction company designs a new office tower with an outer surface mostly made of glass(n glass = 1.52). The company wishes that the glass appear a reddish-orange without having to use coloured glass. Instead, a thin film (n film = 1.65) is used that maximizes the...
  28. C

    Question on thin film interference

    Homework Statement A piece of paper of thickness 15 * 10^-6 m is used to create an air wedge between 2 glass slides that are 7.25 cm long. If the wavelength of the light being used is 595 nm, how many interference fringes are counted across the entire pattern? Homework Equations delta...
  29. T

    What is the minimum thickness for destructive interference in thin film?

    1. Calculate the minimum thickness of the film for which the intensity of the reflected red ray is near zero. (This is AP Physics B 2010 (c)ii.) I found the wavelength in the film to be 4.81x10-7 m nf=1.382. 2L=mλ (destructive interference) The Attempt at a Solution My first attempt yielded a...
  30. A

    Thin Film interference: air wedge

    Homework Statement A pair of very flat glass plates, 7.41 cm long, touch at one end and are separated at the other end by a small piece of 44 gauge copper wire, 5.08×10−5 m in diameter. An air wedge is formed between the glass plates by this supporting wire. Light of wavelength 631 nm...
  31. J

    Thin Film Interference and phasing

    I am looking over thin film interference and am having some difficulty understanding when to know if a reflected ray will be 180 degrees out of phase or in phase. I know that a ray reflecting off a medium with a higher index of refraction will have a 180 degree phase change; and that a ray...
  32. jegues

    Thin Film Interference Patterns

    Homework Statement See figure attached. Homework Equations The Attempt at a Solution Not too sure how to do this one. I tried thinking about what it was doing before the air was replaced with the liquid. With air, The first reflection would have no phase shift (glass...
  33. J

    Understanding Thin Film Interference

    Homework Statement White light is sent downward onto a horizontal thin film that is sandwiched between two materials. The indexes of refraction are 1.80 for the top material, 1.66 for the thin film, and 1.50 for the bottom material. The film thickness is 5.4 10-7 m. Homework...
  34. W

    Family captures 'poltergeist' on film

    Hi all, Can the claim made that this is a ghost be debunked from watching the video alone? http://uk.news.yahoo.com/38/20110329/tod-family-captures-poltergeist-on-film-045b8e8.html"
  35. jegues

    How do I solve this Thick Film, Double Slit problem?

    Homework Statement See figure attached for problem statement as well as my attempt. Homework Equations The Attempt at a Solution I don't know where to go from here. Can someone help me get started?
  36. A

    How to Calculate Minimum Thickness for No Reflection in a Thin Film?

    HELP with thin film problem! Homework Statement Consider a horizontal plane of thin film with a thickness t. This film is located in between air and water (see sketch). Light is directed from the air downward through the film and into the water, perpendicular to the surfaces.The index...
  37. D

    Light reflected from film, find maximum thickness of film, draw phase diagram.

    Homework Statement The light reflected from a soap bubble (n=1.4) appears bright red (wave length= 640 nm) at its center. What is the minimum thickness (in nm) there? Dray Phase Diagram. Homework Equations lambda(n)=lambda/n n=index of refraction 2*n*t=m*lambda OR 2*n*t...
  38. I

    Newton rings: spherical droplet with thin film interference

    Homework Statement So I have a similar situation with the traditional Newton rings. Instead of having however a convex lens, I have a (partial) spherical surface with height d with sitting on top of a thin film of thickness t, with d >>> t, and refractive index n and below the thin film is a...
  39. C

    Find the Optimal Film Thickness for Yellow and Purple Light Reflection

    Homework Statement A client has asked you to produce a sheet of material that will appear yellow for transmitted light and purple for reflected light. You decide that "yellow light" is 600 nm and that "purple light" is 400 nm. If you use MgF2 (n2= 1.39), how think should the sheet be...
  40. D

    Can Software Simulate Variable Magnetic Fields in Thin Film Sputtering?

    Hello everyone. I need to simulate flux densities generated by thin films of permanent magnets of varying composition. This is to guide selection of parameters for sputtering of Nd-Fe-B permanent magnets. Does anyone know of a program which will allow me to simulate fields from permanent...
  41. S

    Determining Exposure Times for Spectrographic Film

    I am taking the spectra of lithium, carbon and mercury on a piece of film with the help of a spectrograph. One of the parameters that affect the readings is the exposure times. (How?) I have to find the correct exposure times experimentally. (Why?) That is because the exposure times depend on...
  42. S

    What is the Phase Difference Between Reflected Waves in a Thin Film of Water?

    Homework Statement Light of wavelength 526 nm is incident normally on a film of water 1.0 µm thick. The index of refraction of water is 1.33. (c) What is the phase difference between the wave reflected from the top of the air-water interface and the one reflected from the bottom of the...
  43. B

    Thin Film Evaporation - Anti-reflective coating

    Hello there, Right now I'm in a physics lab in which I have a vacuum jar, a thin film evaporation apparatus, and the instructions to do something interesting. I'm looking at a bunch of ideas right now, but one project that appeals to me is a multi-layer anti-reflective coating. The way I'd...
  44. C

    Inception: Have You Seen It? Analyze & Discuss

    Kind of late, but has everyone seen this film? Anyone figured it out? What are your theories on what's going on?
  45. T

    Thin film (MgF2 substrate)

    Homework Statement I need to calculate n, k and d of an "unknown" thin film. I have the transmission spectra of the substrate (MgF2) and substrate + "unknown" thin film See the attachments with: three files - two screenshots of the transmission spectra (see file name for description) -...
  46. P

    What is the Formula for Thin Film Interference?

    Homework Statement [PLAIN]http://img403.imageshack.us/img403/2696/33095583.jpg The attempt at a solution I simply took 425 nm and divided it by 4 by using the destructive reflection from thin film. I got 106 nm as my answer, which is c. Is this correct?
  47. G01

    Transmission through thin gold film

    Homework Statement Estimate the transmission of light with \lambda=1\mu m that is transmitted through 20nm thick gold film at 77k where The DC conductivity: \sigma_{DC}=2*10^8 \Omega^{-1} m^{-1}) The carrier density: n=5.9*10^28 m^{-3}) and the plasmon frequency...
  48. A

    Quick help with math in thin film problem

    Homework Statement (1 / 2) (λ1 /nfilm) (m1) = (1 /4) (λ2 / nfilm) (2m2 +1) (2*m2 + 1) / (2*m1) =λ1 / λ2 = 640 nm / 512 nm = 1.25 We want to solve for m1 and m2. I have realized that using m1=m2=2 works but I can't figure out how to reach this conclusion mathematically. Please, any...
  49. A

    Measuring the thickness of a thin film of bismuth for Hall Effect experiment.

    Hello there, I'm an undergrad in my 3rd year and I'm doing an investigation into the 'Preparation of Thin Films and their use in Hall Effect measurements.' We are making thin films of bismuth on glass (with pre drilled terminals) in a vacuum system. The way they suggest measuring the...
  50. S

    Thin film oil drop interference

    Homework Statement Hi all, i have a question on thin film interference. Lets say there is an oil drop on the surface of water. Light reflected from the oil drop is observed from above. Explain why interference fringes are not seen when the thickness of the oil drop increases...
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