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Telescopes

The resolving...

Question

The resolving power of telescope depends on

A

Focal length of eye lens

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B

Focal length of objective lens

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C

Length of the telescope

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D

Diameter of the objective lens

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Solution

The correct option is D Diameter of the objective lens
The resolving power of a telescope is given by $R P \propto \frac{2 μ s i n θ}{122 λ}$
Further, $s i n θ \propto t a n θ \propto$ diameter of the objective.
So, the resolving power of a telescope depends on the diameter of the objective lens.

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