Question

the distance between the pole and the principal focus of spherical mirror is 10cm .What is the focal length of the mirror

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.


Radius of curvature, R = 20 cm
Radius of curvature of a spherical mirror = 2 × Focal length (f)

Hence, the focal length of the given spherical mirror is 10 cm.

Answer 2

Answer: 10cm

Explanation:

R=20

F=r/2

F=20/2

= 10