State whether light slows down or speeds up in the following cases :
Light going from glass to water.

State whether light slows down or speeds up in the following cases : Light going from air to glass.

State whether light slows down or speeds up in the following cases : Light going from water to air.

State the speed of light

What is the shape of the wavefront in each of the following cases ? Light diverging from a point source.

State the speed of light in glass

A ray of light travelling obliquely from glass to air :

Critical angle of light passing from glass to air is least for

The diagram below shows a glass block suspended in a liquid. A beam of light of single colour is incident from liquid on one side of the block. (a) Draw diagrams to show how does the light bend when it travels from liquid to glass and then to liquid if (i) the light slows down in glass, and (ii) the light speeds up in glass. (b) State two conditions under which the light ray passing from liquid to glass travels straight without bending. will the glass be visible then ?

Which of the following travels with the speed of light ?

A: The speed of light in water is not same as that in flowing water. R: The speed of light in water is not independent of the relative motion between the observer and the medium.