Question:medium

A concave lens is kept in contact with a convex lens of focal length \(20\,cm\). The combination works as a convex lens of focal length \(50\,cm\). The power of concave lens is:

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Concave lens \(\Rightarrow\) negative focal length and power.
Updated On: Apr 16, 2026
  • \(P = -3.0\,D\)
  • \(P = +3.0\,D\)
  • \(P = -0.3\,D\)
  • \(P = +0.3\,D\)
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The Correct Option is A

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