A scientist is observing a bacteria through a compound microscope. For better analysis and to improve its resolving power he should. (Select the best option) (a) Decrease the focal length of the eye piece. (b) Increase the wavelength of the light (c) Increase the refractive index of the medium between the object and objective lens (d) Decrease the diameter of the objective lens

Answer: (c). Resolving power of a microscope = (2nsin θ)/(1.22λ). Increasing n (oil immersion) increases it; increasing λ or decreasing objective diameter reduces it; the eyepiece has no effect. So the answer is (c) increase the refractive index of the medium between the object and objective lens.

A scientist is observing a bacteria through a compound microscope… | JEE Main 2023 (29 Jan, Shift 2)

Q12JEE Main 2023 · 29 JAN · SHIFT 2Easy

Resolving Power

A scientist is observing a bacteria through a compound microscope. For better analysis and to improve its resolving power he should. (Select the best option)

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Answer: (c)

Resolving power of a microscope $= \dfrac{2n\sin\theta}{1.22\lambda}$ .
Increasing $n$ (oil immersion) increases it; increasing $\lambda$ or decreasing objective diameter reduces it; the eyepiece has no effect.
So the answer is (c) increase the refractive index of the medium between the object and objective lens.

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Resolving Power question from JEE Main 2023 (29 Jan, Shift 2)

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