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Problem Faced by Surface Based Telescope and Telescopes in Space

The sum of th...

Question

The sum of the focal lengths of the objective and an eyepiece, in case of an astronomical telescope. is equal to : (final image is at $\infty$ )

A

the length of the telescope

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B

half the length of the telescope

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C

double the length of the telescope

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D

none of these

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Solution

The correct option is A the length of the telescope
The sum of the focal lengths of the objective and an eyepiece, in case of an astronomical telescope is equal to the length of the telescope.
Hence, option A is correct.

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