State whether light slows down or speeds up in the following cases:

(a) Light going from air to glass.

(b) Light going from glass to water.

(c) Light going from water to air.

What are primary colours? Name the three primary colours.

Fill in the blanks with the appropriate colour:

(a) Blue + ……………. = Cyan

(b) Red + Blue + ………………… = White

(c) Red + Blue = ………………..

(d) Green + Red = ……………………

Explain the following terms:

1. Incident ray

2. Reflected ray

3. Angle of incidence

4. Angle of reflection

5. Normal