Question

the focal length is spherical lens is (a) the distance between optical centre and principal focus of the lens
(b) the distance between centre of curvature and optical centre of lens
(c) the diameter of the outline lens
(d) the radius of the outline spherical lens ​

Answer 1

Answer:

A) The distance between optical centre and principal focus of the lens.

Answer 2

Answer:

Explanation:

The distance between centre of curvature and optical centre of the lens