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The light gathering power of an astronomical telescope depends upon

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Area of eye-piece

Focal length of objective

Area of objective

Length of tube

answer is D.

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Detailed Solution

Because of large objective area more light is gathered.

As magnification $m = \frac{β}{α}$

$β$ = angle subtended at the eye by the final image

$α$ = angle subtended by the object at the lens or eye

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