MHT CET 2026 Physics question

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?

(A)decreasesCorrect
(B)increases
(C)remains constant
(D)first increase and then decreases

Answer: (A)

Solution

The magnifying power of a simple microscope (image at the near point) is . The focal length of a lens is given by . The refractive index is smaller for red light than for blue light (red is deviated least), so

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Question ID VK-099308