In telescopes for a given wavelength, the objectives with large aperture are used for (a) greater resolution. (b) reducing lens aberration. (c) greater magnification. (d) ease of manufacture.

Answer: (a). Limit of resolution θ = (1.22λ)/(D), so a larger aperture D gives a smaller θ. Smaller θ means finer detail is resolved (higher resolving power); a large aperture also gathers more light. So the answer is (a) greater resolution.

In telescopes for a given wavelength, the objectives with large… | MHT CET 2026 (17 Apr, Shift 1)

Q2MHT CET 2026 · 17 APR · SHIFT 1Easy

Resolving Power

In telescopes for a given wavelength, the objectives with large aperture are used for

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Answer: (a)

Limit of resolution $\theta = \dfrac{1.22\lambda}{D}$ , so a larger aperture $D$ gives a smaller $\theta$ .
Smaller $\theta$ means finer detail is resolved (higher resolving power); a large aperture also gathers more light.
So the answer is (a) greater resolution.

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