Question

why prism is needed for binoculars​

Answer 1

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Prism binoculars employ prisms in the optical system to rectify an inverted image projected by the objective. The prism also shortens the optical path, resulting in a compact body.

Answer 2

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⇒Prism binoculars employ prisms in the optical system to rectify an inverted image projected by the objective. The prism also shortens the optical path, resulting in a compact body.