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5.1 Reflection, refraction and lenses

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Question 31

An optical safety system needs a lens that spreads a narrow beam of light so that it covers a wide detector.

LensInformation
Aconverging, focal length 0.50 m
Bdiverging, focal length -20 cm
Cdiverging, power −3.5 D-3.5\ \mathrm{D}−3.5 D

Use P=1fP=\dfrac{1}{f}P=f1​, where f f\,f is in metres.

a.

Calculate the power of lens A and the power of lens B.

[3]
b.

Explain which lens should be used to spread the beam most strongly.

[3]
Markscheme

5.1 Reflection, refraction and lenses Questions

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

93 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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