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MHT CET 2026 (16 Apr, Shift 1) · Optical Instruments & the Eye

Optical Instruments & the Eye question from MHT CET 2026 (16 Apr, Shift 1)

Q1MHT CET 2026 · 16 APR · SHIFT 1Easy

Optical Instruments & the Eye

A simple microscope is used to see the object first in blue light and then in red light. Due to the change from blue to red light, what is the effect on its magnifying power?

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Answer: (a)

Magnifying power of a simple microscope: $M = 1 + \dfrac{D}{f}$ .
$\mu_{red} < \mu_{blue} \Rightarrow f_{red} > f_{blue}$ , so $M$ becomes smaller.
So the answer is (a) decreases.

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