Question

Q.14 The refractive index of material of a convex lens is changing with time as u = Ho (1+ a sin wt) .At t = 0 the
focal length of the lens is fand Mo, a, w are constant (a, is very small). A luminous point object is placed on
principal axis at distance 3f from the optical centre. The image appears to oscillate simple hamonically the
amplitude of image is
3afuo
9afuo
9afuo
(A)
(C)
(D) None
2(40 -1)
4(4.-1)
2(40 -1)​

Answer 1

Answer:

see the attachment