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5.1 Reflection, refraction and lenses

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Question 20

A camera repair technician tests three spare lenses and records the results.

lenstypemeasurement
Xconvergingfocal length 25 cm
Yconvergingpower +2.0 D+2.0\ \mathrm{D}+2.0 D
Zdivergingfocal length 20 cm

Lens power P P\,P is given by P=1f\displaystyle P=\frac{1}{f}P=f1​, with f f\,f in metres.

Which lens is the strongest and which lens is the weakest?

[1]
A

strongest: Z; weakest: Y

B

strongest: Y; weakest: X

C

strongest: X; weakest: Z

D

strongest: Y; weakest: Z

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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