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Question

A converging lens has a focal length 40cm. Calculate its power.


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Solution

  • A converging lens is a lens whose power is Positive.
  • The relationship between power and focal length of the lens

Powerofthelens=100Focallengthofthelens(cm)Poweroflens=10040Poweroflens=+2.5D

Hence the power of the converging lens is +2.5D.


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