Question

length 12 cm.
31. A student has obtained a point image of
a distant object using the given convex
lens. To find the focal length of the lens he
should measure the distance between the:
34
(a) lens and the object only
(b) lens and the screen only
(c) object and the image only
(d) lens and the object and also between
the object and the image​

Answer 1

Answer:

a...lens and the object only...

because a point sized image is obtained when the object is placed on the focus on the lens.