Question

in Newtownian telescope _______ mirror is used
1) elevated 2) concave 3) convex 4) rough​

Answer 1

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b) concave mirror ✔️

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The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror.

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Answer 2

Explanation:

concave is the answer

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