Help in physics question!?

Question

According to Einstien,speed of light remains constant in all frames of refrence.But during refraction dosen't it change(if i choose this as the frames of refrance)?

Answer 1

Light in a vacuum travels at a constant speed.

It will slow down if it enters a medium - such as water.

Its phase phase velocity will be altered, it changes direction, and its wavelength may increase or decrease - only the frequency stays constant.

It's what cause magnification, rainbows, and other optical illusions.

Answer 2

Funny how you mention refraction because refraction is caused by the changing of speed of light. The theory is not wrong, you just didn't grasp what it is about.

Answer 3

Nope it doesn't change... it just get to the your eyes slower for example:

Object A and B

Object B is 100meters away, Object A is 5 meters away.... If ever there would be a lightning the A would be seen first then B. Because light takes a longer time to travel in your eyes. But of course you can't notice this.

But air has weight so light travels faster in a vacuum than a place with air. It travels faster in Space. What your saying is different and it would take me another long explanation. whew lol =)

Answer 4

Speed of light in free space is constant.

Answer 5

The speed of light is always constant, it's just that in certain mediums it appears to slow down. This is because a photon travelling through, for example, water will very quickly run into an atom. One of the electrons in that atom will be promoted to a higher energy level, then after some delay it will drop back down again and the photon will be re-emitted.

Therefore, the more this happens, the "slower" the speed of light is in that medium, but in actuality the speed of light is always a constant 299,792,458 m/s.

Answer 6

its relative

Answer 7

Ok If light passes through the air it travels at 3x10 to the power 8

However when light passes through glass it changes to 2x10 to the power 8  

Answer 8

Light speed is the same in all frames of reference, the theory is correct, but it refers to light "in vacuuo" i.e. in a vacuum, and it refers also to the maximum group velocity of light, not the phase velocity, which can exceed c.

The answers noting that it changes speed when encountering a material are correct.

Light speed in the vacuum and light speed in air are more or less identical.