31/12/20                                   Light-9

1.Define the following:

a. Source of light: Objects that give out light are source of light. eg: Sun, candle

b. Luminous object: Object that emit light of their own are called luminous object. eg: Sun, bulb

c. Refraction of light:  The change in the direction of light when passing from one medium into another is called refraction of light.

Short Answer:

Question 1: HW

Question 5: HW

2. The Moon is non-luminous. Why are we still able to see it at night?

A. The Moon does not have its own light, it reflects the light of sun so we are able to see it at night.

3. What is reflection of light? How does it help us to see an object?

A. The bouncing back of light is called as reflection of light.  When light falls on an object it reflects back and reach our eyes so we are able to see an object.

4. Explain how a rainbow is formed in the sky.

A. A rainbow is formed in the sky when sunlight passes through raindrops and splits into many colours. It is the property of light of splitting into different colours when passed through a prism. Here raindrops act as prism.