Question

1. Define the principal focus of a concave mirror
2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
3. Name a mirror that can give an erect and enlarged image of an object​

Answer 1

Answer:

1. Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

2. So, focal length = 21× radius of curvature = 21×20 cm = 10 cm.

3. A concave mirror gives an erect and enlarged image of an object held between pole and principal focus of the mirror.

Explanation:

hope it's helpful u.....