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Question

In a reflecting telescope, a _______ mirror is used in place of the objective lens.

A
convex
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B
plane
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C
concave
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D
(a) and (c) above.
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Solution

The correct option is C concave
In a reflecting telescope, only a concave mirror is used instead of the objective lens, because it helps to gather large amount of light coming from the object, due to which a sharper and clearer image of the distant object is formed.

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