A person is observing a bacteria through a compound microscope. For better analysis and to improve the resolving power he should (a) increase the wavelength of light. (b) increase the refractive index of the medium between the object and objective lens. (c) decrease the focal length of the eye-piece. (d) decrease the diameter of the objective lens.

Answer: (b). Resolving power of a microscope: RP = (2nsin θ)/(1.22λ). Increasing n (oil immersion) increases RP; increasing λ or decreasing aperture lowers it, and fe does not affect it. So the answer is (b).

A person is observing a bacteria through a compound microscope. For… | MHT CET 2024 (4 May, Shift 1)

Q15MHT CET 2024 · 4 MAY · SHIFT 1Easy

Optical Instruments & the Eye

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

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Answer: (b)

Resolving power of a microscope: $RP = \dfrac{2n\sin\theta}{1.22\lambda}$ .
Increasing $n$ (oil immersion) increases $RP$ ; increasing $\lambda$ or decreasing aperture lowers it, and $f_e$ does not affect it.
So the answer is (b).

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