Reflection, refraction and lenses

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Question 53
Easy

The equation relating the power of a lens to its focal length is:

power (in dioptres)=1focal length (in metres) \text{power (in dioptres)} = \frac{1}{\text{focal length (in metres)}} power (in dioptres)=focal length (in metres)1​

An optometrist prescribes a corrective lens with a power of 2.5 dioptres.

Calculate the focal length of this lens in cm.

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Reflection, refraction and lenses Questions

  1. GCSE
  2. /Physics
  3. /Reflection, refraction and lenses