Correct option is B
The Correct answer is (B) - Both (A) and (C).
To produce a parallel beam of rays from a point source of light, we need an optical device that can focus the rays in a parallel direction.
Convex lens : A convex lens can be used to produce a parallel beam of rays when the point source of light is placed at its focal point. The rays emerging from the lens will then be parallel. This is because a convex lens converges parallel rays to a focal point, or vice versa, if the light source is at the focal point.
Concave lens : A concave lens diverges rays, so it cannot produce a parallel beam of rays from a point source. It would spread the rays out instead.
Concave mirror : A concave mirror can also produce a parallel beam of rays if the point source is placed at its focal point. The rays reflecting off the mirror will be parallel.
Convex mirror : A convex mirror diverges rays, so it cannot produce a parallel beam of rays from a point source.
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