All Questions
Tagged with reflection speed-of-light
44
questions
0
votes
1
answer
27
views
Beam displacement at focal point
I'm working on a project that uses galvanometers with mirrors. They're configured to have a focal point of 175mm. The motors rotate at 1 mechanical degree per 500mV, that will be 2 degrees optical per ...
- 11
0
votes
0
answers
32
views
What is the speed of light during reflection? [duplicate]
What is the speed of light in a vacuum when the light reflects off of a mirror?
- 331
1
vote
0
answers
75
views
Why did Einstein include reflection of light from a moving mirror in his paper? [closed]
Einstein, in his 1905 relativity paper, allocates a section to the issue of reflection of light from a moving mirror and derives three formulas (angle, frequency, energy). What was his reason or ...
- 264
2
votes
1
answer
119
views
What is the speed of light in case of Critical Angle?
When light travels from an optically denser to a rarer medium, it bends away from the normal and at a specific angle of incidence, the angle of refraction is ${90}^{\circ}$. When the angle of ...
0
votes
0
answers
24
views
Apparent violation of laws of reflection for an inertial observer [duplicate]
I am actually having an introductory course in Special Relativity in which I was looking at the Michelson Morley experiment. And I have this silly confusion.
The setup for the Michelson Morley ...
- 8,230
3
votes
0
answers
106
views
If light cannot change speed, how can it be absorbed or reflected? [duplicate]
Consider a simple model:
A single photon of light in a vacuum travels from (-1,0) to (0,0) , where it hits a reflective point at the origin at time T.
CASE 1: Suppose the velocity of light follows a ...
- 131
1
vote
2
answers
261
views
Relativistic mirror
A (very long) mirror is moving from left to right at 0.5c and we point a laser at it perpendicularly as it passes in front of us. (it glides in its own plane, like the windows of a train)
How will the ...
- 171
23
votes
7
answers
11k
views
Does real life have "update lag" for mirrors?
This may sound like a ridiculous question, but it struck me as something that might be the case.
Suppose that you have a gigantic mirror mounted at a huge stadium. In front, there's a bunch of people ...
- 371
3
votes
1
answer
256
views
If a photon strikes a perfectly reflecting mirror, it is essentially at rest at the instant of collision. So why does the photon exist?
Photons can only move at the speed of light.how do we define its existence at the instant when it collides with a perfect mirror?
- 421
1
vote
2
answers
348
views
Mirror moving near the speed of light
Suppose I am looking at a moving mirror, the image will move at twice the speed of the mirror but what if the mirror was to move with half the speed of light? How will my image look and what if the ...
- 67
1
vote
1
answer
53
views
Reflection on moving mirrors [closed]
Say I have an endless mirror, in a x y plane, at y=1.
Situation 1: the mirror is stationary and when we send light vertically from the origin, the light reflects back and returns to the origin.
...
- 73
1
vote
1
answer
288
views
Why is intensity required here?
Q)A point source of light is placed at the centre of curvature of a hemispherical surface. The radius of curvature is r and the inner surface is completely reflecting. Find the force on the hemisphere ...
- 135
1
vote
1
answer
265
views
Advantage of using a polygonal mirror with larger number of faces in Michelson method of measuring the speed of light and its value
The following image is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Speed of Light", page 447, topic "Michelson Method":
For higher image resolution click here.
...
- 5,306
2
votes
2
answers
264
views
Number of reflecting surfaces in the rotating mirror in the Michelson method of determination of speed of light
The following text is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Speed of Light", page 447, topic "Michelson Method":
For higher image resolution click here.
...
- 5,306
0
votes
0
answers
52
views
How does the use of concave mirror over plane mirror advantageous in the Fizeau method of determination of speed of light?
The following text is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Speed of Light", page 445, topic "Fizeau Method":
One can use a concave mirror in place of the ...
- 5,306