Standard Books Physics Lens Combination MCQ Question with Solution

Two identical glass (μ_g = 3/2) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (μ_w = 4/3). The focal length of the combination is

A

f

B

f/2

C

4f/3

D

3f/4

Correct Answer

Option D

Detailed Explanation

The focal length of the combination is calculated using the lens maker's formula and considering the effect of the water lens. The effective focal length is determined by the combination of the glass lenses and the water lens, resulting in a focal length of 3f/4.

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