Question

Radius of curvature of convex miror is 40 cm. Find its focal length.

Answer 1

20 cm as focal length is half of the Radius of curvature

Answer 2

Hey friend,

as we know,


Radius of curvature is just double of focal length.

i.e., R = 2f

R = radii of curvature.
f= focal length.

so if R=40cm

therefore f=R/2

i.e., 40/2=20cm.

hence, focal length is 20cm.

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thank you