Question

concave lens diverges the light rays . give reason

Answer 1

Concave lens diverges the light rays because of its surface on each end. The concave shape bends the rays coming on to them away from the principal axis and away from the Pole. So the rays diverge and they do not meet after refraction.

The rays parallel to principal axis bend towards vertical at the first surface and further upwards at the second surface. This happens for the parallel rays above the principal axis. For rays that are incident below the principal axis, the par axial rays diverge away from principal axis and towards down ward direction. So all the rays from the lens diverge.

Answer 2

Answer:

1. A concave lens can be regarded as made of a very large number of portions of triangular prisms.

2. The bases of these prisms are towards the edges of the lens, i. e., away from the central thinner portion of the lens.

3. A ray of light passing through a prism bends towards its base.

Hence, a concave lens diverges the rays of light.

Explanation:

1. Concave lens :

A lens having both spherical surfaces curved inwards is called a concave lens or double concave lens or biconcave lens.

2. It is thicker at the edges than in the middle.

3. A concave lens is also called a diverging lens.