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Q.

A 2cm diameter coin rests flat on the bottom of a bowl in which the water is 20cm deep (μw = 4/3) . If the coin is viewed directly from above, the apparent diameter of the coin is

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a

2 cm

b

1.5 cm

c

2.67 cm

d

1.67 cm

answer is A.

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Detailed Solution

For a plane refractive surface, the lateral magnification is 1. Hence apparent diameter of the coin =2cm  

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