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Q: Which of the following optical devices can be used to produce a parallel beam of rays from a point source of light? A. Convex lens B. Concave lens C. Concave mirror D. Convex mirror
  • A. Both B and C
  • B. Both A and C
  • C. Both A and B
  • D. Both A and D
Correct Answer: Option B - When a point source is held at focus of a concave mirror or a convex lens, we get a parallel beam of light.
B. When a point source is held at focus of a concave mirror or a convex lens, we get a parallel beam of light.

Explanations:

When a point source is held at focus of a concave mirror or a convex lens, we get a parallel beam of light.