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5.1 Reflection, refraction and lenses

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Question 4

A specialized macro lens attachment for a smartphone camera has a focal length of 18 mm18\text{ mm}18 mm.

Calculate the power of this lens.

Use the equation:

power=1focal length \text{power} = \frac{1}{\text{focal length}} power=focal length1​

where power is in dioptres (D) and focal length is in metres (m).

Give your answer to 2 significant figures.

[3]
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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