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Question

Why is the objective lens of an optical telescope made very large?

A
To collect the maximum light possible.
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B
To avoid interference.
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C
To make the image as bright as possible.
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D
To reduce cost.
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Solution

The correct options are
A To collect the maximum light possible.
C To make the image as bright as possible.
To increase the brightness of an image, it is required to collect the maximum possible light coming from the source. This is achieved by making the objective lens as large as possible.

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