When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of:

Which of the following properties of light conclusively support wave theory of light?

(a) Light obeys laws of reflection.

(b) Speed of light in water is smaller than the speed in vacuum.

(c) Light shows interference.

(d) Light shows photoelectric effect.

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. All of these