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The ratio between the sine of angle of incidence in water to the sine of angle of incidence in air is 0.75 . Calculate \({}^{a}\mu_{w}.\)
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\[ {}^{w}\mu_{a} = \frac{\sin i}{\sin r} = 0.75 \]
\[ {}^{a}\mu_{w} = \frac{1}{{}^{w}\mu_{a}} \]
\[ \text{or } {}^{a}\mu_{w} = \frac{1}{0.75}\]
= 1.33
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