Question

Describe an experiment to illustrate the meaning
of the terms total internal reflection' and critical
angle'. Explain why:
(a) a ray of light in air incident on a glass surface
cannot be totally reflected.
(b) a water surface viewed from above may act as
a mirror.

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Answer 1

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Describe an experiment to illustrate the meaning of the terms total internal reflection' and criticalangle'.

Explain why:

• (a) a ray of light in air incident on a glass surface

cannot be totally reflected.

• (b) a water surface viewed from above may act as

a mirror.

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1) When a ray of light passes from a less dense material (eg air) into a denser material (eg glass or water) it is bent away from the surface between the two materials. This means that in this situation the angle of refraction is always less than the angle of incidence.

2) The Snell law say what the ray is refracted deflected closer to the normal. Then there will never be any reflection (total internal), then not can work like a mirror.

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