Test Index

WAEC Physics 2012 Paper

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Question : 26

Total: 47

A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is

\;\frac{4}{3}

and air to glass is

\;\frac{3}{2}

, calculate the refractive index of glass relative to water

0.50
0.67
0.75
1.13

Solution:

${}_g \eta_w = \frac{\;{}_g \eta_a}{\;{}_a \eta_w}$

= $\;\frac{3}{2} \times \;\frac{1}{\frac{4}{3}}$

= $\;\frac{3}{2} \times \;\frac{3}{4}$

= $\;\frac{9}{8}$

= 1.125

= 1.13 (to 2 d.p)

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