Edexcel IGCSE Physics 3.20 Total Internal Reflection Questions

Practise explaining total internal reflection in optical fibres, prisms and glass-air boundaries using critical angle and refractive index.

Exam points

explain TIR using travel from higher to lower refractive index and angle above critical angle
draw the continued ray path in a fibre or prism, reflecting at the boundary by equal angles
link a higher refractive index to a lower critical angle for coloured light

[Maximum number: 2]

This question is about refraction.

The torch is moved below the surface of the water. Light from the torch is incident on the water surface at an angle greater than the critical angle.

A ray of light leaves the torch as shown in the diagram.

Complete the path of the ray of light.

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