Which of the following is used as a primary mirror in a Newtonian telescope?

Plane mirror

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Concave mirror

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Convex mirror

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Eyepiece

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Solution

The correct option is B Concave mirror
From the above image of the Newtonian telescope's ray diagram, we can see the light ray first strikes the primary mirror which here is a concave mirror. The secondary mirror in case of the Newtonian telescope is a plane mirror.

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