Refraction — Set 4

Refraction of sound in the atmosphere is mainly due to change of?

At night, distant sounds are often heard more clearly mainly because sound waves?

Optical fibers guide light mainly by?

Which device commonly uses optical fiber bundles to transmit images?

What is the refractive index of vacuum?

If n1 and n2 are absolute refractive indices, then relative refractive index of medium 2 w.r.t medium 1 is?

If refractive index of a medium is 1.33, the ratio v/c is approximately?

When angle of incidence equals the critical angle, the refracted ray makes angle?

If light in a denser medium strikes the boundary at an angle larger than the critical angle, then?

A ray travels from air into water. In general, it bends?