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JEE MAIN Physics QUESTION #985
Question 1
A symmetric thin biconvex lens is cut into four equal parts by two planes \(AB\) and \(CD\). If the power of the original lens is 4 D, then the power of a part of the divided lens is:
  • 1 D
  • 8 D✔️
  • 2 D
  • 4 D
Correct Answer Explanation
Cutting along \(AB\) (perpendicular to axis) halves the lens — each half-lens has the same radii but acts as a plano-convex lens; power doubles to 8 D. Cutting along \(CD\) (along the axis) does not change power. Each quarter piece has power 8 D.