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

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Concave mirror as well as a convex lens

Convex mirror as well as a concave lens

Two plane mirrors placed at

90 °

to each other

Concave mirror as well as a concave lens

answer is A.

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Detailed Solution

A concave mirror and convex lens can make a parallel beam of light when the light comes from a point source, incidents on them.
When a parallel ray of light from infinity is reflected from the concave mirror, it passes through the focus point. Its reverse is also true. That is if a ray of light passes through the focus of the concave mirror, then after reflecting from the surface of the mirror, it becomes parallel to the axis of the mirror.
The same thing is applicable in the case of convex lenses. If a ray of light is passed through the focus of the convex lens, then after refracting through the convex lens, it becomes parallel to the axis of the lens.

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