Quelpr
4 marksCritical Angle and Total Internal Reflection

CSEC Physics · January 2018 · Paper 2 · Question 1(d)

Figure 2 shows light travelling in the core of a fibre optic cable as it reflects off the cladding.

If the refractive index from the cladding to the core is 1.03, calculate the critical angle in the core.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)Complete Table 1 by calculating the values of sin r and sin i.[5 marks]
  2. 1(a)(ii)Using the calculated values in Table 1, plot a graph of sin r against sin i on the grid on page 5.[8 marks]
  3. 1(a)(iii)Calculate the gradient of the graph.[4 marks]
  4. 1(b)State the name of the physical property represented by the gradient in (a)(iii).[1 mark]
  5. 1(c)(i)Explain the term 'critical angle'.[2 marks]
  6. 1(c)(ii)Using Table 1, or otherwise, state the critical angle for the glass used in (a).[1 mark]

More practice: the rest of this paper · more Critical Angle and Total Internal Reflection questions · all CSEC Physics past papers