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Answer Posted / gulshan kumar
Binocular:-It is optical instrument in which two small telescopes are fitted. Though the telescopes are short the effective length of the telescope is indirectly increased by the help of two right angled prism. In this way it can have great magnifying power and large field of view
The focusing is done by screen arrangement. We can have erect image in a binocular vision. In place of prism opera glass may be used.
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