Question

Radius of curvature of a concave minor is 30 cm. Wha is its focal length?

Answer 1

Dear Student,

◆ Answer -

Focal length of concave mirror = -15 cm

● Explaination -

# Given -

Radius of curvature = 30 cm

Focal length = ?

# Solution -

Focal length is always half of the radius of curvature -

|f| = R/2

|f| = 30/2

|f| = 15 cm

For concave mirror, focal length is negative. Hence, focal length of concave mirror is -15 cm.

Thanks dear. Hope this helps you...