- #1

LCSphysicist

- 646

- 161

- Homework Statement
- .

- Relevant Equations
- .

I was doing a exercise which considerst he time it takes for light travels a glass with thickness proper D and velocity v. The speed of light is c/n inside the glass.

Now, my approach was to go to the glass frame, take the relative speed between the glass and the light using the trivial formula for addition of velocity in SR, so i would got ##r##. The time it would take is ##D/r## and the distance ##D##. SO i would apply Lorentz transformations to go back to the ground frame.

But the answer was simply ##D/(c/n)##. Now we can understand what does this answer apply: speed of light is the same in all frame.

But, i though that the right way to interpret special relativity was that the

And not that

I think you can see the difference and how this implies different answer to the question.

So, my interpretation is wrong? Or both are equivalent? what am i missing?

Now, my approach was to go to the glass frame, take the relative speed between the glass and the light using the trivial formula for addition of velocity in SR, so i would got ##r##. The time it would take is ##D/r## and the distance ##D##. SO i would apply Lorentz transformations to go back to the ground frame.

But the answer was simply ##D/(c/n)##. Now we can understand what does this answer apply: speed of light is the same in all frame.

But, i though that the right way to interpret special relativity was that the

**maximum and "unique(in all frame)" speed is c, coincidentally this is the speed of light in vacuum.**And not that

**maximum and "unique(in all frame)" speed is the speed of light, which in vacuum is c.**I think you can see the difference and how this implies different answer to the question.

So, my interpretation is wrong? Or both are equivalent? what am i missing?