Question

Q.40 The aperture of a spherical lens will be equal to a) twice the focal length of the lens. b) twice the radius of curvature of the lens. either (a) or (b) D c d) none of these​

Answer 1

Option "c" is correct.

the aperture of a spherical lens will be equal to both twice the focal length of the lens and twice the radius of curvature of the lens.