Question:medium

What is the relative decrease in focal length of a lens for an increase in optical power by \(0.1\ \text{D}\) from \(2.5\ \text{D}\)?

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Since \(P=\frac{1}{f}\), increase in power causes decrease in focal length. Relative decrease \(=\frac{P_2-P_1}{P_2}\).
Updated On: May 15, 2026
  • \(0.04\)
  • \(0.40\)
  • \(0.1\)
  • \(0.01\)
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The Correct Option is A

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