Question

A convex lens with f = 6 cm is cut vertically into two halves. then the focal length of each part is

(a) 3 cm
(b) 6 cm
(c) 12 cm
(d) 18 cm​

Answer 1

Answer:

(d) 18 cm

Explanation:

(d) 18 cm........................

Answer 2

Answer:

12

Explanation:

if the lens is cut perpendicular to principal axis or vertically the focal lens doubles so 6 doubles so 12 and if we cut horizontally it does not change so 6cm