Question

A laser beam shines along the surface of a block of transparent material (see Fig. E33.8). Half of the beam goes straight to a detector, while the other half travels through the block and then hits the detector. The time delay between the arrival of the two light beams at the detector is 6.25 ns. What is the index of refraction of this material?

Short answer

The index of refraction of material is 1.75

Step-by-step solution

Determine the refractive index

Use the formula of refractive index

Also,

So,

Therefore, the refraction of the material is 1.75