Question

Two convex lenses of power 2D and 5D are separated by a distance \( \frac{1}{3} \, \text{m} \). The power of optical system formed is

• A. +2D
• B. -2D
• C. +3D
• D. -3D

Hint:

When combining lenses with a separation distance, use the formula for the effective power of the system.

Answer 1

The Correct Option is C

The total power of the system is the sum of the individual powers of the lenses, but since the lenses are separated by a distance, the effective power is given by \( P = P_1 + P_2 - \frac{d}{f_1 f_2} \).