Question

1. Describe a method to measure the focal length of a
concave mirror.​

Answer 1

Answer:

To determine the focal length of a concave mirror, by obtaining image of a distant object. A concave mirror, a rectangular piece of wood as a screen or white wall and a meter scale. A distant object situated at a distance which is many many times the focal length of a mirror is regarded as an object at infinity

Explanation:

Answer 2

Answer:

first a straight line is drawn from centre of spree which the mirror is part to half of mirror.

when the rays parallel to principal axis the ray get reflect and meet at q perticular point that is focus point the length from focus to pole is focal length