Question

Give reason: 1.Pole star is always visible in the sky 2. Convex lens is also called converging lens

Answer 1

1 The North Star, also known as Polaris, is known to stay fixed in our sky. It marks the location of the sky's north pole, the point around which the whole sky turns. Or u Can say that the location of pole star is near the earth's north pole hence is always visible

2 it is also called a converging lens because it makes parallel light rays passing through it bend inward and meet (converge) at a spot just beyond the lens known as the focal point

Answer 2

A concave mirror, or converging mirror, has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point.They are used to focus light.