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Problem Faced by Surface Based Telescope and Telescopes in Space

The objective...

Question

The objective of an astronomical telescope is a convex lens of ....................... focal length.

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Solution

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It consists of two convex lenses called objective and eyepiece. The objective is of large focal length whereas the eyepiece is of short focal length. The distance between the two lenses can be adjusted by adjusting the tube which holds the lens.

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