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If a concave lens has a power of -5 D, what is its focal length? (2021)

Practice Questions

Q1
If a concave lens has a power of -5 D, what is its focal length? (2021)
  1. -20 cm
  2. -25 cm
  3. -15 cm
  4. -10 cm

Questions & Step-by-Step Solutions

If a concave lens has a power of -5 D, what is its focal length? (2021)
  • Step 1: Understand that the power (P) of a lens is related to its focal length (f) by the formula P = 1/f.
  • Step 2: Since the power of the concave lens is given as -5 D, we can write this as P = -5.
  • Step 3: Rearrange the formula to find the focal length: f = 1/P.
  • Step 4: Substitute the value of P into the formula: f = 1/(-5).
  • Step 5: Calculate the focal length: f = -0.2 m.
  • Step 6: Convert the focal length from meters to centimeters: -0.2 m = -20 cm.
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