# Questions tagged [refraction]

Change in the direction of propagation of a wave when its transmitting medium changes.

932 questions
Filter by
Sorted by
Tagged with
268 views

### What will happen if the refractive index of lens is less than unity? [duplicate]

Generally the refractive index of any lens is greater than air. My question is what will happen if the refractive index of lens is less than unity?
110 views

### Gravitational refraction

I recently used another venue to ask about the speed of gravity, specifically if the speed of gravity is constant or if it is subject to refraction when passing through media, akin to light. The ...
14k views

### Does light loses its energy when it passes through denser medium?

I know it does not because it emerges out of denser medium at 300,000 KM per second, but according to $E=mc^2$ and given that speed of light decreases inside denser medium with refractive index ...
291 views

### A Question About Brewster's Law

In most textbooks I read, they state that when the angle of reflection + angle of refraction = 90, there is maximum polarization. What I don't understand is what maximum polarization means. Does it ...
940 views

### Focal length of magnifying glass

Why a magnifying glass has a short focal length? According to its work the object must be between the focus and the optical centre, a large focal length will favour it, then why is it so?
37 views

### A Physics Problem Involving Refraction [closed]

I'm not sure how to solve this problem. I've considered using Malus' law, but then I don't know what theta is, preventing me from solving this problem.
1k views

58 views

### Refractive screen for myopia [closed]

Is it possible to create a screen for a computer monitor to allow a Myopic person to see the screen without glasses?
176 views

### Looking through a glass hemisphere [closed]

I've found the following question on IsaacPhysics.org . I've been working on it for a couple of hours but I cannot figure it out. A looking glass is used to read an ancient scroll. This lens has a ...
175 views

### Evanescent Wave Refraction

I recently learned that a beam of light that undergoes total internal reflection leads to the formation of an evanescent surface wave on the reflection surface. What happens if this wave encounters a ...
36 views

### Part of reflection/transmission of an impinging beam under 90°

I would like to know if there is something like a thumb of rule for a light beam impinging a surface under $90°$. In regards to Snelius there will be no refraction. But what about the amount of ...
51 views

### Working principle of an optical stretcher

I understand that while using an optical stretcher experimental apparatus we attach a small dielectric ball to the specimen of study which can either be a DNA molecule, a Biological cell or any ...
59 views

### Photon frequency when transitioning from one medium to another

$E=h\nu$ where $\nu$ is frequency and $h$ is Planck's constant. The frequency, wavelength and speed are related as $c=\lambda\nu$. When transitioning from one medium to another the speed decreases by ...
105 views

### What type of mirage is this?

I am very new to the world of mirages and would like some information as to the type of mirage in this picture which I took this morning. It is the cargo ship African Kalmia which passed my location ...
278 views

### Why does light bend towards the normal when passing through a denser medium?

When light passes from a medium with less refractive index to a medium with higher refractive index, it bends towards the normal. But why normal . Of course we can take an example of a car moving from ...
190 views

### Interference of 2 particular waves in Newton's rings experiment

The rings formed in this experiment are due to the interference of light reflected from the top and bottom surfaces of the thin film of air between the plano convex lens and the glass plate below it. ...
576 views

### Refraction of X-rays

According to Snell's Law, refraction occurs when an electromagnetic wave passes from one medium to another. My question is, how are x-ray images able to be produced if the x-rays refract as they pass ...
74 views

### What are the physical optical limitations photonic metamaterials can offer?

Modern technology has introduced new photonic metamaterials that can extend optical properties beyond what standard materials can offer. For example a negative index of refraction is now possible ...
96 views

### Is the speed of light in the Universe always $c$?

Every one here knows that $c=(ε'×μ')^{-1/2}$. But what if ε' and μ' are different values in other parts of the visible universe. Maybe near the center of a Quasar galaxy or even a Neutron star?
198 views

### How does light actually interact with different materials? - PBR

I am a computer graphics guy in the area of physically based rendering and recently I've been searching on the net to figure out how physical is Physically Based Rendering (PBR). The nature of the ...
659 views

### What is bent light speed?

I have a question, if there is a straight beam of light that moves at the speed of light, is there a way to calculate the speed of bent light? since bending light causes it to lose momentum? Example, ...
41 views

### Literature on Reflection/Refraction of Waves

I completed the first year of my bachelor in Physics and astronomy in July. One of the courses was 'Waves and Optics' which we used the second half of Alonso & Finn's 'Fields and Waves' for. I ...
42 views

### What determines the property of vacuum that allows EM field to propagate?

As in case of sound it the disturbance that propagates by exchange of energy between particles. what is analogously related to em wave, where there is propagation of energy stored in electric and ...
3k views

### Arrow that changes direction home experiment

I saw this cool optical effect in a experiment on Youtube: https://www.youtube.com/watch?v=G303o8pJzls Could anyone explain to me why the arrow points in the opposite direction? I have read ...
212 views

### Is the reason the sunshine is 'extra bright' after rain due to refraction of the additional water in the air?

Quite frequently after the sun comes out after rain I experience a 30 minute period where the sunshine is 'unusually bright'. Such that it makes my eyes water. My question is: Is the reason the ...