Which of the following can make a parallel beam of light when light from a point source incident on it?

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Concave mirrors as well as convex lenses

Convex mirror as well as concave lens

Two plane mirrors placed at

90^{\circ}

to each other

Concave mirror as well as concave lens

answer is A.

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Detailed Solution

Concave mirrors as well as convex lenses can make a parallel beam of light when light from a point source incident on it.
When light rays from a point source strike a concave mirror and a convex lens, the emergent beams are parallel, and an image at infinity is formed. A virtual image is always formed by a convex mirror and a concave lens. When the object is kept in focus, the resulting beams are not parallel but diverging.

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