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What is the focal length of a concave lens with a power of -2 diopters?

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Question: What is the focal length of a concave lens with a power of -2 diopters?

Options:

  1. -0.5 m
  2. 0.5 m
  3. -2 m
  4. 2 m

Correct Answer: -0.5 m

Solution: 

Power (P) = 1/focal length (f). Therefore, f = 1/P = 1/(-2) = -0.5 m.

What is the focal length of a concave lens with a power of -2 diopters?

Practice Questions

Q1
What is the focal length of a concave lens with a power of -2 diopters?
  1. -0.5 m
  2. 0.5 m
  3. -2 m
  4. 2 m

Questions & Step-by-Step Solutions

What is the focal length of a concave lens with a power of -2 diopters?
Correct Answer: -0.5 m
  • Step 1: Understand that the power of a lens is related to its focal length. The formula is Power (P) = 1/focal length (f).
  • Step 2: Identify the power of the lens given in the question, which is -2 diopters.
  • Step 3: Use the formula to find the focal length. Rearrange the formula to solve for focal length: f = 1/P.
  • Step 4: Substitute the power into the formula: f = 1/(-2).
  • Step 5: Calculate the focal length: f = -0.5 meters.
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