When diameter of the aperture of the objective of an astronomical telescope is increased, its

Magnifying power is increased and resolving power is decreased

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Magnifying power and resolving power both are increased

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Magnifying power remains the same but resolving power is increased

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Magnifying power and resolving power both are decreased

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Solution

The correct option is C Magnifying power remains the same but resolving power is increased
Resolving power of telescope increases with size, magnification, hence focal length, is independent.

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a

\frac{2 a}{1.22 λ}

0.2

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