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A 2 cm diameter coin rests flat on the bottom of a bowl in which water is 20 cm deep $(\mu_w= \large\frac{4}{3})$. If the coin is viewed directly from above what is its apparently diameter?

$(a)\;2\;cm \\ (b)\;1.5\;cm \\ (c)\;2.67\;cm \\ (d)\;1.67\;cm $

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For a plane refracting surface, the lateral magnification is 1.
Thus the image of coin will be of same size as coin its effect.
Hence a is the correct answer.
answered Feb 19, 2014 by meena.p

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