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Q: Focal length of concave lens. . . . . . it occurs
  • A. zero
  • B. negative
  • C. infinite
  • D. positive
Correct Answer: Option B - The focal length of a concave lens is negative. While the focal length of the convex lens is positive.
B. The focal length of a concave lens is negative. While the focal length of the convex lens is positive.

Explanations:

The focal length of a concave lens is negative. While the focal length of the convex lens is positive.