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2 marksLight Waves

CSEC Physics · May/June 2007 · Paper 2 · Question 4(a)

In the seventeenth century, two conflicting theories concerning the nature of light were put forward.

State what these theories considered light to be.

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  1. 4(b)Indicate, by ticking the relevant boxes, the properties which these theories can explain. Place an X in the box if the theory CANNOT satisfactorily explain the…[4 marks]
  2. 4(c)(i)What is meant by 'total internal reflection' at point C?[2 marks]
  3. 4(c)(ii)Is the refractive index of the cladding greater or smaller than that of the core?[1 mark]
  4. 4(c)(iii)Draw on Figure 3, the ray that shows the path of the light continuing on from C.[1 mark]
  5. 4(c)(iv)Calculate the angle of incidence of the light entering the fibre.[3 marks]
  6. 4(c)(v)Given that the speed of light in air is 3 x 10⁸ m s⁻¹, determine the speed of light in the core of the fibre.[3 marks]

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