An object is placed at different distances u; from a converging lens of focal length; 15.0cm. For what value of u does the lens act as a microscope?

A. u = 15cm only
B. u = 30cm only
C. M < 15cm only
D. u > 30cm only

Correct Answer:

Option D = u > 30cm only

Explanation

Objects at a distance greater than two times of the focal length produces a real image, inverted and diminished in size.

→ 2 * 15 = 30cm

: At >30cm this is applicable