Reflection, refraction and lenses

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Question 9
Easy

A smartphone macro lens attachment has a power of +12.5 dioptres.

The relationship between the power of a lens, PPP (in dioptres), and its focal length, fff (in metres), is:

P=1f P = \frac{1}{f} P=f1​

Calculate the focal length of this macro lens attachment in millimetres (mm\text{mm}mm).

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Reflection, refraction and lenses Questions

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