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Q: A lens having power 8 D is kept in contact with another lens having power –4D. The lens combination will act as a:
  • A. concave lens having focal length 25 cm
  • B. convex lens having focal length 25 cm
  • C. convex lens having focal length 50 cm
  • D. concave lens having focal length 50 cm
Correct Answer: Option B -
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Explanations:

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