Q

Which devices can produce a parallel beam from a point source? A. Convex lens; B. Concave lens; C. Concave mirror; D. Convex mirror.

RRB Group-D 25/08/2022 / Shift-III 2022
✓ Answer: B Both A and C
A point source at the focus of a convex lens or concave mirror produces a parallel beam.
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