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5.1 Reflection, refraction and lenses

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Question 2

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).

[2]
Markscheme

5.1 Reflection, refraction and lenses Questions

  1. GCSE
  2. /Physics
  3. /5.1 Reflection, refraction and lenses

24 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.

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