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6 marksProperties of Waves

CAPE Physics Unit 1 · 2007 · Paper 2 · Question 7(c)

A larger dispersion of the two colours of light may be produced by using a diffraction grating. What is the angle between rays of the two colours if a grating with 1200 lines per millimetre is used? The wavelength of the red light is 678 nm and that of the blue light is 422 nm.

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Other parts of this question

  1. 7(a)(i)Define the term 'refractive index' of a medium as it applies to light waves.[1 mark]
  2. 7(a)(ii)Draw a diagram showing the refraction of waves moving from one medium to another in which the velocity is slower.[2 marks]
  3. 7(a)(iii)Derive the law of refraction, n₁ sin θ₁ = n₂ sin θ₂, for waves moving from one medium to another.[3 marks]
  4. 7(a)(iv)State the relationship between the frequencies of the waves in the two media and the relationship between wavelengths in the two media.[2 marks]
  5. 7(b)(i)What is the speed of EACH of these colours of light in the glass?[6 marks]
  6. 7(b)(ii)A mixture of red and blue light is incident on the prism as shown in Figure 8. What is the angle between the two emergent rays?[6 marks]

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