The tag has no usage guidance.

learn more… | top users | synonyms (1)

1
vote
1answer
56 views

Will I see the light?

There is a perfectly smooth wall. We have a slit parallel to it. Through that a laser beam passes. As the slit is parallel to wall the laser beam will hit it normally. So now if I see obliquely I ...
1
vote
0answers
22 views

Why a wave, travelling in a lighter medium, inverts upon reflection from an interface of a denser medium? [duplicate]

As exactly the title says: Why a wave, traveling in a lighter medium, inverts upon reflection from an interface of a denser medium ? What are the things that go on at the interface ?
0
votes
1answer
142 views

How to calculate a straight edge diffraction pattern

A straight edge diffraction pattern is not the same as a slit or multiple slit diffraction pattern. The spacing between fringes is not equal but gradually gets smaller the farther out you go as in the ...
2
votes
2answers
41 views

Total internal reflection in a simple pane of glass - why can we see through?

Consider looking through a glass window pane at high angles of incidence. At the front face of the pane, there is no total internal reflection since the light is traversing an air to glass interface. ...
1
vote
1answer
96 views

Can sound reflect from itself?

If it is possible, what kind of conditions would be necessary? The case with electromagnetic waves could also be interesting, but I don't think that is possible.
0
votes
2answers
38 views

Same amount of light, spread across larger surface area = more reflection?

I've noticed an odd phenomenon with an adjustable-focus LED flashlight that I've bought. If I shine it at the ceiling of my room at the widest possible angle, the walls get noticeably brighter than ...
0
votes
0answers
38 views

Remote sensing reflectance

I am not getting something simple for reflectance for a lambertian surface when dealing with remote sensing applications. I am trying to derive the equation from ...
0
votes
0answers
60 views

Derivation of the formula related to number of images?

I have read in my book that if two mirrors are inclined at an angle $\theta$, if 360/$\theta$ is even , the number of images is given by (360/$\theta$) -1 What is the derivation of this formula? I ...
0
votes
2answers
69 views

Can light be rotated using lenses or prisms?

I was wondering if it was possible, by using only lenses, mirrors, or prisms, to rotate a ray of light coming from a certain direction. For example, if I have two lasers beams side by side, is it ...
1
vote
0answers
29 views

Light reflecting off a sphere

Suppose light of momentum $-P\hat{\textbf{k}}$ is shone on a sphere. What is the momentum transferred onto the sphere? I think the transferred momentum upon reflection is given by ...
1
vote
0answers
49 views

Pair of Mirrors Facing Each Other [duplicate]

If you have two mirrors facing each other and you introduce a light source into the reflections and you take the light source away, would it immediately go away for all reflections in the "tunnel" of ...
0
votes
1answer
47 views

Reflection of light on semi-infinite solid

The following statement is often made concerning reflection on glass: "When light is normally incident on a glass surface, about 4% gets reflected and the rest is transmitted. The reflected wave is ...
1
vote
0answers
19 views

Why is a rainbow in the sky always an arch? [duplicate]

It's been raining a lot lately in the bay area of California (thankfully! keep it coming rain gods!) which puts me and my dad in a contemplative mood. The rain has given us something to contemplate: ...
2
votes
3answers
864 views

Is white a single color? [duplicate]

We have seen the Newton disc, when it is rotated it produces white color. So I want to know whether white exists as a single color or is that a combination of multiple colors?
1
vote
0answers
48 views

Which Method for finding velocity of an object in the mirror is correct? [closed]

My Professor asked a question, "A person is seen jogging in a rear view mirror of focal length $1$m. He is at a distance $39$m from the mirror. His jogging speed is given to be $5 \frac{m}{s}$. ...
1
vote
0answers
31 views

What are both way dielectric polarized mirror

I'm looking for a material that would reflect lights on one side but would allow with as little as possible filtering luminous light coming from behind. Normal both way mirror seems to filter too ...
0
votes
1answer
65 views

What will happen in this LASER setup?

If I have 3 rectangular mirrors, say of dimensions length of 1 meter and width of 0.5 meter and I arrange them in the form of an equilateral triangle, which is of side 0.5 meter.(The mirrors are ...
1
vote
1answer
48 views

The property of transparent lens [closed]

My question is this : what is the property of transparent material that is used for lens?. I think that it allows the light to pass through ( absorption property) and does not bend the light ( ...
0
votes
0answers
31 views

Why does vertical polarizer absorb the vertically polarized waves?

They explain that vertical wires serve as the secondary transmitter: the waves induce since oscillations of electrons in the wire effectively absorbing the wave. Ok, let's believe that wave is ...
0
votes
0answers
45 views

Proving law of reflection using Huygens principle

So I was reading the proof of law of reflection using Huygens principle but as I am new on this website so I can't attach a picture,so I will try to explain by writing only. The problem I face is ...
10
votes
3answers
763 views

Using a black hole as a mirror?

http://www.youtube.com/watch?v=ENd8Sz0AFOk The YouTube video is a good example how the gravity of this merging binary black holes bend light around themselves.
1
vote
1answer
30 views

Does less heat equals more reflexion? [duplicate]

Does colder metal reflect more if hotter metal reflect less? Why?
1
vote
0answers
22 views

Relation between radius of curvature and heat produced at focus when concave mirror is kept in sunlight [duplicate]

Hi I am newbie here and this is my first question so please do not mind if I don't use the correct language or anything. I want to know the relation between size of a concave mirror ( measured by ...
3
votes
1answer
53 views

How is sound affected when reflected off a vibrating membrane?

When sound produced at a frequency, say 200Hz is reflected off a vibrating membrane, vibrating at another frequency, say 10Hz, what are the properties of the reflected wave in terms of frequency and ...
-3
votes
1answer
77 views

Which gives the most realistic pictures, Mirror, camera or their combination? [closed]

By googling, I have found several different opinions about how to take one's own facial images more realistically: Some said photos taken by cameras (smartphone's cameras, if specific) are more ...
0
votes
1answer
72 views

Bounced ray angle of normal direction? (SOLVED) [closed]

TL;DR whats the position of C. I'm currently programming something and for some reason I having problem figuring this one out, imagine having a ray / or ball bouncing (without mass or gravity etc) ...
1
vote
4answers
79 views

If a silver atom scatters light isotropically, what happens if only a single photon is scattered?

From this question :Why is the light reflected at the same angle from mirror? and this part of the answer: The starting point it that a single silver atom is far smaller than the wavelength of light, ...
3
votes
1answer
51 views

100x magnifying optics system for short laser pulse

I am now designing an experiment that consists of a 400 nm short pulse (~300 fs). In the experiment, we need to magnify the transverse profile of the pulse by 100x. That's the problem. I was ...
1
vote
2answers
62 views

Light and mirrors [duplicate]

When I shine a beam of light at a mirror why does the ray go in the exact opposite direction (tested with protractor). Why does it not go back in exactly the same direction? The beam is of an ...
4
votes
2answers
278 views

Dimensional Paradox Demonstrated by Light Moving Between Parallel Mirrors

In a thought experiment, there are two parallel mirrors which are very long which also face each other. One has a hole in it and one flash from a strobe light shines into that hole. One observer in ...
-3
votes
1answer
106 views

Combination of mirror and lenses [closed]

I am a keen learner of physics, but I am unable to solve problems involving lenses and mirrors together. please can anybody tell me the method to solve these problems? for instance let us take a ...
1
vote
1answer
40 views

Will the ray of light follow the laws of reflection at the interface of two media?

Suppose at the boundary of two optical media,of different refractive indices a mirror is kept perpendicular to surface of the boundary.If a ray of light travels through one of the media and then ...
0
votes
1answer
32 views

how (n) number of eyes can see one dot (for example red dot) from different place at same time?

Today, me and my brother looked at red point of the wall (that was a red sticker for kids), and we saw the red point even we changed our locations in the room, and I can argue that everyone can see it ...
1
vote
2answers
73 views

How to measure 8 μm surface bumps?

I want to measure surface bumps which are larger in size than $8\ \mathrm{\mu m}$ on a uncoated plastic mirror. So it can be any number of smaller bumps and that would not effect the application. I ...
1
vote
2answers
48 views

Let's suppose I am to display the letter R on mirror as well water , will I get the same images?

As far as my practical experience goes both look quiet the same when an image of any object is formed on them, yet I wanted to be ascertained is there any actual visible differences between both the ...
0
votes
0answers
6 views

Seeing multiple objects with penetrative EM reflections

If you had a static source of penetrating EM radiation, like a metal detector and you are trying to detect several types of known objects buried at different heights, orientations and potentially ...
0
votes
1answer
62 views

Is there proof that a reflected photon is the original photon before reflection?

I came accross the DIRAC-Ansatz in On the Notation of MAXWELL’s Field Equations where it says Therefore as another consequence there must exist two different kinds of photons, which interact in ...
0
votes
2answers
54 views

Is there any limit to distance between two waves when used in Huygens principle?

Apologising for not being clear. When I used Huygens principle to determine the spherical wavuefront of radius $R/2$ created by reflection from a spherical concave lens of radius $R$, I got amazingly ...
1
vote
1answer
89 views

Wave reflection, boundary conditions?

When a wave-pulse is reflected such that initially it was moving in the denser medium, and towards the other side of the interface lay the rarer medium, will there have been a phase change post ...
2
votes
2answers
42 views

Space station illuminated by the Earth

Let's say that we have a space station orbiting the Earth around the equator at a speed of 360 degrees per 24 hours, always being roughly on the line between the centers of the Earth and the sun. From ...
1
vote
1answer
45 views

Boundary behaviour of a mechanical wave

Let us assume we have a taut rope and I introduce a pulse in it by whipping one end. Now if instead of a clamp, I have tied the other end of the rope to a denser rope, a part of the energy is ...
1
vote
1answer
90 views

An intuitive explanation regarding propagation of mechanical waves

I was studying mechanical waves today and have questions regarding how a pulse is propagated on a string and its reflection and transmission at a boundary and I hope I can find help here. First, ...
0
votes
0answers
22 views

Reflection and absorbtion of EM-wave in dielectric plate (calculate through dipole)

The task: there is a plate with thickness $h$. Also $\sqrt{|\epsilon|}kh \ll 1, k = \omega/c$. Find reflection and absorbtion of EM-wave in this plate. EM-wave falling normally on plate. What I did ...
5
votes
2answers
158 views

Transmitted Power and Poynting's theorem contradiction?

I was reading Chapter 12.1 in Hayt & Buck "Engineering Electromagnetics" 8-th edition. Here they discuss the reflection of uniform plane waves at normal incidence. They derived the following ...
1
vote
1answer
191 views

Explanation for Refraction of light (change of angle) and Reflection

Refraction: I want a qualitative Quantum Mechanical explanation of why do we see light rays -in the classical picture- bend when light goes from one medium to another. I read that it is due to ...
0
votes
1answer
18 views

what happens to light energy when it is stored in a prism with angleA > angle R

In a glass prism if any light is incident for which angle of prism is twice the critical angle than it does not escape prism.Does it mean it has become like a black hole which eats away all visible ...
2
votes
2answers
428 views

Why is light energy 100% reflected in total internal reflection?

during reflection of light energy transfer is not 100%. when light from a rarer medium like air strikes a denser medium like glass slab, some part of light is reflected back and some of it is ...
0
votes
1answer
118 views

Why is it desired to have an aperture of a spherical mirror to be less than the radius of curvature?

In many instances, I have noticed that it is given that the aperture is less than the radius of curvature for a spherical mirror. Why is this given like that?
0
votes
0answers
51 views

How do chirped mirrors compensate dispersion?

How do chirped mirrors compensate dispersion? I understand that if you have longer wavelengths penetrating deeper into a chirped Bragg stack, then there will be some anomalous dispersion because the ...
1
vote
2answers
245 views

Can matter have 100% reflection?

Is it possible to have matter that reflects all the light and does not absorb light at all? If thats possible then we can store light inside it right? I think we can trap light inside that matter in ...