Question

Find the focal length of a convex mirror whose radius of curvature is 90 cm​

Answer 1

Given-

Radius of curvature,

R = 90cm

Radius of curvature = 2 x Focal length (f)

=> R = 2f

=> f = R/2

=> f = 90/2

=> f = 45cm

Hence-

The focal length of the given convex mirror is 45cm.

Answer 2

Answer:

Here is your answer:

Explanation:

r=90cm

r=2*focal length

f=r/2

f=90/2

f=45cm

hence proved.