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Q: Suppose a point source is incident on a system and it produces a parallel beam of light with respect to the principal axis of the system. The system is:
  • A. either a concave mirror or a concave lens
  • B. either a convex mirror or a convex lens
  • C. either a concave mirror or a convex lens
  • D. Two plane mirrors perpendicular to each other
Correct Answer: Option C - When a point source is incident on a system and it produces a parallel beam of light with respect to the principal axis of the system then the system is either a concave mirror or a convex lens.
C. When a point source is incident on a system and it produces a parallel beam of light with respect to the principal axis of the system then the system is either a concave mirror or a convex lens.

Explanations:

When a point source is incident on a system and it produces a parallel beam of light with respect to the principal axis of the system then the system is either a concave mirror or a convex lens.