Refraction Definition and 751 Threads

Hi. After reading about self-focusing in plasmas I came across the relative index of refraction that a light wave experiences during the interaction with plasma. Namely n = \sqrt{1-\frac{{\omega_p}^2}{{\omega}^2}} where \omega_p is the plasma frequency and \omega is the light (for example laser)...

Homework Statement Eyeglass lenses can be coated on the inner surfaces to reduce the reflection of stray light to the eye. If the lenses are medium flint glass of refractive index 1.62 and the coating is fluorite of refractive index 1.432, (a) what minimum thickness of film is needed on the...

Homework Statement A parallel beam of light containing two wavelengths, λ1= 400 nm and λ2= 650 nm, enters the silicate flint glass (at a angle of 41 degrees, relative to normal) of an equilateral triangle (60 degrees at each angle) prism. At what angle, relative to the normal, does each beam...

as far as i know, when plugged in, SLM 's change index of refraction to accommodate the phase changes happening to the input (light). Is there a range for the possible values of the index of refraction?

Dear friends I am new at this forum thank you for accepting my application first of all. My question is that I don't understand the optics/physics behind the reason why Si-based CCDs are not sensitive for IR-light (above 1000-1100 nm) if on the top of the p-type Si there is a SiO2 layer which...

Or does it happen wib other types of wave too? Just a simple answer please - with a clear YES or No. Thanks in advance ☺

As light travels through water, it's wavelength is shortened to compensate for the decrease in speed. This explains why there is little to no red light at depth. My question is: a) do these wavelengths eventually reach ultraviolet and beyond, for example at extreme depth are there only x rays...

Hello, This has been bugging me for some time now, so I would be interested to see what I have been missing so far. Imagine a single ray of light (made up of many photons) hitting a perfectly non-absorbing (for this wavelength of light) spherical dielectric object, which has finite mass. The...

A person completely under sea water tracks the sun. Compared to an observer above water, which of the following observation would be made by the underwater observer? Neither the time of sunrise or sunset nor the angular span of the horizon changessunrise is delayed, sunset is advanced but no...

Homework Statement A fish watcher at point P watches a fish through a glass wall of a fish tank. The watcher is level with the fish; the index of refraction of the glass is 8/5, and that of the water is 4/3. The distances are d1=8.0 cm, d2=3.0 cm, and d3=6.8 cm (a) To the fish, how far away...

Homework Statement Moving through air, a wave hits a steady area of water with a angle of 13°. The velocity of the wave in air is 550 m/s and in the water 1650 m/s. What is the refraction angle of the wave? Does the angle move away or to the line of symmetry? Btw. I think I translated it...

Homework Statement The two rays shown below, a and b, have different wavelengths. They travel through the glass prism as shown; 1) is this possible? 2) If this is possible, which has the longer wavelength, ray a or ray b? [see attached figure] Homework Equations λ = λi/n critical angle =...

Homework Statement I'm having trouble / uncertainties about the third missing angle (from left to right) in the picture. The first angle of reflection was easy as it's just 34 degrees as well and I used snell's law rearranged to find the first angle of refraction as 13.36 degrees from the...

Homework Statement I am given the following figure: These are converging rays that appear to be going to a point F convert to a plane wave upon hitting the boundary between n2 and n1, and I am asked to find the equation for the boundary between n1 and n2 that perfectly accomplishes this...

Homework Statement I must determine the refractive index of the adhesive tape. Tools I can have is: laser, tape, carton, scissors etc. I don't know how to do it. Homework Equations n=c/v n=sin alfa/sin betaThe Attempt at a Solution I tried a lot of configurations to observe something but...

Here is a problem that showed up on my exam that I couldn't find any variation online. A stick of length L is depth D in the water. The stick is parallel to the surface of the water, and the viewer (in air) is looking down in the water right over the middle of the stick. What is the apparent...

Hi! I'm doing a light research project and to have a refraction and reflection ( I don't know if it's like this in eglish) visual representation I came up with this photo. I don't know the name of this tool and also what is it made of? In my opinion is just a glass but I don't really know. Thanks!

I would like to know why the frequency of a wave doesn't change after a refraction. I have seen some arguments about Energy conservation that in order to conserve energy "Assuming no reflection" the same amount of waves must be coming out in the same time. But That raises a question, Why can't...

I am studying Bsc physics. Edit by mod: removed spam Please give me the details about the above question.

Homework Statement I need to describe an experiment in which I would use internal reflection to determine the index of refraction of material Homework Equations Snell's law The Attempt at a Solution I understand the concept of internal reflection, such as the critical angle etc. I am just...

Homework Statement The refractive index of diamond is 2.42. A ray of light passing from the inside of a diamond into air makes an angle of incidence of 20 degrees. Find the angle of refraction. Homework Equations n = refractive index aNd = 2.42 (my book said the speed of light in a vacuum and...

What is the intuition for why the frequency of light does not change as it passes from a less dense medium to a denser one (or vice versa)? Classically, if we treat light in terms of waves, then intuitively, is the reason why the frequency does not change because it is determined by the...

Hi I am new to the forums. Only undertaken basic physics. Had a thought the other day and wanted to share it. Is lensing of starlight such as einstein rings ever caused by refraction? Could a matter density gradient theoretically cause the same effect? Thanks guys Sorry if its a repost...

Homework Statement A laser is fired into a wet paper placed ontop of a glass plate of thickness ##d## and an angle of ##0## degrees. When the light hits the paper and goes through the plate it forms a circle of light of radius ##R##. What is the index of refraction of the glass plate? Homework...

Homework Statement A spherical surface of roc 10 cm separates 2 media x and y of refractive indices 3/2 and 4/3 respectively. Centre of the spherical surface lies in the denser medium. An object is placed i x medium. For image to be real, the object distance must be ---- A) >90 cm B) <90 cm...

I have a pretty good understanding that when polarized light is incident on a surface it will change handedness (Right handed polarization, to left handed polarization for example) and remains will remain circular if it is incident at an angle less than the Brewster angle, otherwise it will...

Homework Statement A fish is 60 cm under water. A bird directly overhead looks at the fish. If the bird is 120 cm above the water level, find the apparent position of the fish as seen by the bird. The question is solved by using the principles of refraction. But, if the bird is directly...

Hi guys, I read a lots of papers about this theme, but still I don't understand what is going on. I have slab of negative index of refraction material, inside the material the evanescence field is amplified. I want to calculate transmission of this slab for evanescence waves, so I used fresnel...

Homework Statement look at the figure and prove that sina'=nsinb. We have given a, b, a', b' and n http://s32.postimg.org/n7rnu0khx/image.png Homework Equations sinb'/sina'=1/n The Attempt at a Solution But in the equation we have b, not b'. I made the figure. How would the correct one be?

Homework Statement A ray of light falls on the surface AC of a prism with a straight angle and with two sides equal. For which incidence angle the ray won't come out of the surface AB. The index of refraction for the prism is n=2. Homework Equations sina/sinb=n2/n1 The Attempt at a Solution...

Homework Statement Two rays of light fall on a surface of the prism. Do they remain parallel after they come out from the prism? Homework Equations sina/sinb=n2/n1 The Attempt at a Solution I think they do, as the incidence angles are equal, the refraction angles are equal they become...

Homework Statement http://s32.postimg.org/4urcaq0xx/image.png The incidence angle of a light ray over a tile of glass with dy faces parallel is pi/3 rad. Find the distance between the incidence point and the refraction one of the ray with the tile, if the distance between these rays is 0.7 cm...

Homework Statement When the incidence angle is equal to the angle of refraction? Homework Equations sina/sinb=n2/n1The Attempt at a Solution I think as a=b => sina=sinb => n1=n2. We should have the same environment? But is that refraction?

Homework Statement [/B]I am supposed to fill out a table with the values of θi and θr with the given information of n1 being 1.00 and n2 being 1.50 for the first row, and I am not quite sure how to do that just knowing the values that were given. I am also supposed to find the sine of θi and...

The index of refraction for a gas depends on temperature, as well as pressure. What is an experiment that would determine the temperature dependence of the index of refraction of air?

Homework Statement I need to find how a ray of light will travel from the snail towards Andrews eye. I need to find the angle of incidence and angle of refraction. I know the index of refraction of both materials Air: 1 Water 1.33 Homework Equations Snells law 1.33 *sin(X) = sin(y) x is...

(Sorry my poor English.) How could we explain the bending of light after refraction? The wave in my example will cause the charge to move in the y direction. Now, analysing it from the particle point of view of light, since the momentum must be conserved, as the charge moves in a direction, the...

Hello PF users hope all is well! I need a reminder of the formulas needed in order to get "Sine of angle of incidence" "Sine of angle of refraction" And "Index of refraction". The only information I have available now is "Angle of incidence" And "Angle of refraction" I'm guessing...

I've been told contradicting ideas about this. I've been told that light doesn't travel at a constant speed everywhere (i.e. light slowing down in speed after entering a more dense medium). However, I've also read that light speed is constant everywhere (i.e. if you could travel close to the...

Can someone help me in solving this question ? my attemp is sin42/sin 90 to get the refractive index then n =sin i/sin r to get c and for b n=1/sinc

https://en.wikipedia.org/wiki/Negative_refraction http://www.cmth.ph.ic.ac.uk/photonics/Newphotonics/pdf/DRS&JBP_final_.pdf Supposed the nature of light is altered and light itself cause negative refractive index in normal lenses.. what would we see with our eyes, lenses, binoculars? What...

Consider reflection and refraction of a plane light wave on a vacuum-uniaxial crystal interface. As it is well-known, when the optical axis of the uniaxial crystal is parallel or perpendicular to the normal vector of the interface, there is no double refraction for a natural (unpolarized)...

You know the proofs for finding the apparent depth of a swimming pool, or object submerged in one? Well, it always assumes the object is directly above the original object. Does anyone know where the assumption comes from? (see below)

Homework Statement Dispersion in a window pane. In Figure (a) below , a beam of white light is incident at angle θ1 = 67o on a common window pane (shown in cross section). For the pane's type of glass, the index of refraction for visible light ranges from 1.535 at the blue end of the spectrum...

I've learned that when wavelength increase the frequency decreases. But in Refraction, there is a mention about frequency remains same but the wavelength and speed changes. Why does the frequency doesn't change? I thought when when wavelength is short the peaks are closer to each other so...

I can't seem to find anything online that talks about this distinction. I understand how when the water gets shallower that part of the wave gets slowed down so the overall alignment parallels with the shore. However, I wouldn't think that would change the actual direction of the wave. I need a...

Homework Statement A thin converging lens has radii of curvature of R1=9cm and R2=-11cm. Assume its focal points F1 and F2 are 5cm from the center of the lens. Determine its index of refraction. Homework Equations Len's Makers equation: 1/f = (n2 - n1 / n1) (1/R1 - 1/R2) The Attempt at a...

What cause the refraction of light? I read somewhere the change of speed but the angle is also important. But why the light refract to the thicker part of an optical lens?

Homework Statement Within a certain material, an EM wave with = 1 mm is attenuated to 10% of its original intensity after propagating 10 cm. Determine the imaginary part of the index of refraction ni Homework Equations 3. The Attempt at a Solution [/B] so...

An object is within a glass sphere of radius R with a refractive index of 1.5 . I'm trying to calculate the displacement of the virtual object relative to the actual when viewed from the side, such that the refracted ray emanating from the object becomes horizontal. I would like to know S (the...