Question

A convex lens of focal length 10 cm is painted black at the middle portion as shown. An object is placed at a distance of 20 cm from the lens.

Answer 1

Answer:

Explanation:

Here, A convex lens of focal length 10 cm is painted black at the middle portion. and an object is placed at a distance of 20 cm from the lens.

=> If optical axis of both parts is same. Thus, lens will act as one lens only even after application of paint.  In this case, only one image will be formed.

=> suppose, optical axis of both parts are different then two images will be formed.

=> According to question, optical axis of both parts is same in the given condition.

=> Hence only one image will be formed by lens.