Which of the following relations is true for focal length (f) and the radius of curvature (r)?
f = 2r
f = r/2
f = r/2 + 1
f = r + 2
Which of the following relations hold good where F is the focal length and R is the radius of curvature.
Which of the following relations hold good for 'R' and 'F', where 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of the mirror?