Which of the following optical instruments are used in a Cassegrain telescope?

Concave mirror

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Convex mirror

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Concave lens

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Convex lens

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Solution

The correct options are
A Concave mirror
B Convex mirror
D Convex lens
The Cassegrain telescope uses a concave mirror. The light rays after reflection from the concave mirror are reflected back towards it by a small convex mirror. They pass through a hole at the centre of the concave mirror and then through the eyepiece situated at the back of the mirror. The eyepiece gives a magnified image of the source.

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