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WAEC Physics 2010 Paper

Question : 28

Total: 50

Solution:

Concept:

Snell's law relates the refractive index of a medium to the angles of incidence and refraction.

Explanation:

From Snell's law,

n = \dfrac{\sin i}{\sin r}

From the diagram, the angle of refraction is

r = 90^\circ - i

Using

\sin(90^\circ - i) = \cos i

, we get:

n = \dfrac{\sin i}{\cos i}

Therefore,

n = \tan i

This corresponds to option A.

Answer:

n = \tan i

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