Question

why prisms are used in the telescope​

Answer 1

Answer:

A star diagonal, erecting lens or diagonal mirror is an angled mirror or prism used in telescopes that allows viewing from a direction that is perpendicular to the usual eyepiece axis. It allows more convenient and comfortable viewing when the telescope is pointed at, or near the zenith (i.e. directly overhead).

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Answer 2

Prisms can reverse the direction of light by internal reflection,

Telescopes use multiple prisms in a single unit as a means of manipulating light traveling great distances to meet the eye.

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