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3 marksRefraction

CSEC Physics · May/June 2011 · Paper 2 · Question 4(b)(i)

Figure 2 shows a narrow beam of white light which is shone onto a triangular prism at an angle of incidence of 30°.

If the angle of refraction for the violet light, θᵣ, is 20°, what is the refractive index of this prism for violet light?

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Other parts of this question

  1. 4(a)Describe how he can set up the apparatus to be able to observe an interference pattern of light and dark bands on the white screen and briefly explain why this…[6 marks]
  2. 4(b)(ii)Calculate the speed of the violet light in the prism.[3 marks]
  3. 4(b)(iii)Calculate the frequency of violet light if the wavelength in air is 430 nm. [1 nm = 10⁻⁹ m, Velocity of light in air = 3.0 × 10⁸ m s⁻¹][3 marks]

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