Film Definition and 346 Threads

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...

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?

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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)...

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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...

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...

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...

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...

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)

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...

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?

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...

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...

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...

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...

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...

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...

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...

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

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

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)...

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...

" 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!

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

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.

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 =...

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

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...

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...

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...

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...

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...

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

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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...

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...

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...

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...