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Can you help me with optics question?
A beam of light moves in a slab of glass of refractive index n in the positive x direction. The slab itself also moving in the positive x direction with a speed v in the laboratory frame. What is the speed of the beam of light as measured in the laboratory frame?
a) c
b) (c^2.n+cv)/(c+nv)
c) c(1-1/n)
d) (c^2+vcn)/(cn+v)
@Ashok
I know what you said. But doesn't the speed of light vary in glass? I mean according to Snell's law
n1/n2=v2/v1 ? So the velocity of light inside the glass slab becomes c/n here.
Still the answer will be c?
2 Answers
- 9 years agoFavorite Answer
Definitely speed of light is less
It is c/n where n is the refractive index of the glass with no effect due to motion of the slab as stated by Ashok but it does not matches with any of the options : (
- Anonymous9 years ago
According to einstein light has no relative speed,that means if you have a car that goes at light speed and race with light still you cant catch up with light, from the car frame also u will see light traveling at speedc
same condition applies to your question even if labaratory frame is moving at speed v light has samr speed c
Hope this h.elps
