Page 645 - SUBSEC October 2017_Neat
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(ii) Define the ‘critical angle’.
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[2 marks]
(iii) State what is meant by ‘total internal reflection’, explaining the significance of the
word ‘total’.
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[3 marks]
(f) Figure 3 shows a prism of index of refraction of 1.45 in air. DO NOT WRITE IN THIS AREA
Figure 3
(i) Determine the critical angle for light travelling from the prism into air.
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[2 marks]
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