Resolving power of a telescope can be increased by increasing (a) the diameter of eyepiece. (b) the wavelength of light. (c) the focal length of eye-piece. (d) the diameter of the objective.

Answer: (d). Resolving power = (D)/(1.22λ), where D is the diameter of the objective. It does not depend on the eyepiece, and it falls if λ increases. So the answer is (d) the diameter of the objective.

Resolving power of a telescope can be increased by increasing | MHT CET 2025 (5 May, Shift 2)

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Resolving Power

Resolving power of a telescope can be increased by increasing

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Answer: (d)

Resolving power $= \dfrac{D}{1.22\lambda}$ , where $D$ is the diameter of the objective.
It does not depend on the eyepiece, and it falls if $\lambda$ increases.
So the answer is (d) the diameter of the objective.

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