Question

3. Hold a concave mirror with its shining surface towards the sun. Take a sheet of paper and hold it in front of the mirror. Take the sheet of paper away from the mirror gradually till a sharp, bright spot appears on the paper. The sharp, bright spot is due to- (a) reflection of light (b) refraction of light (c) scattering of light (d) diffraction of light​

Answer 1

Answer:

b) refraction of light

Explanation:

Answer 2

The sharp, bright spot is due to- (a) reflection of light.

What is reflection of light?

• Reflection is a property of light according to which light rays bounce back in the same medium when it is incident on a polished or shining surface.

What happens in the present scenario?

• When rays from sun is made to incident on the shining surface, it converges the incident rays at a point on principle axis.
• Rays coming from infinity gets focussed on Focal point on principle axis.
• The paper behaves as a screen and when it is moved away from the mirror, at some point it gets to a point of focus of concave mirror and that is where the image of sun is formed as a bright spot.