MHT CET 2023 Physics question

A person is observing a bacteria through a compound microscope. For better observation and to improve its resolving power he should

(A)increase the wavelength of light
(B)increase the refractive index of the medium between the object and objective lensCorrect
(C)decrease the focal length of the eyepiece
(D)decrease the diameter of the objective lens.

Answer: (B)

Solution

The resolving power of a microscope is , where is the refractive index of the medium between the object and the objective, the half-angle subtended by the objective at the object, and the wavelength. So resolving

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Question ID VK-095291