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If the focal length of a lens is 20 cm, what is the power of the lens?

Practice Questions

1 question
Q1
If the focal length of a lens is 20 cm, what is the power of the lens?
  1. +5 D
  2. +10 D
  3. -5 D
  4. -10 D

Questions & Step-by-step Solutions

1 item
Q
Q: If the focal length of a lens is 20 cm, what is the power of the lens?
Solution: Power (P) = 1/f (in meters). Here, f = 0.2 m, so P = 1/0.2 = +5 D.
Steps: 0

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