Fill in the following blanks with suitable words:

(a) Light travelling along a ____ is not refracted.

(b) Light bends when it passes from water into air. We say that it is _____

State whether the following statement is true or false: Refraction occurs because light speeds up in denser materials.

Why does a ray of light bend when it travels from one medium to another?

What is meant by ‘refraction of light’? Draw a labeled ray diagram to show the refraction of light.

A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Draw a labeled ray diagram to show the complete path of this ray of light. Mark the two points where the refraction of light takes place. What can you say about the final direction of ray of light?