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Q.

A tank is filled with water to a height of 12.5 cm. The apparent depth of needle lying at the bottom of the tank is measured by a microscope as 9.4 cm. The speed of light in water is

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a

2×108ms−1

b

3×108ms−1

c

2.256×108ms−1

d

1.5×108ms−1

answer is C.

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Detailed Solution

μ=C0Cm=dRdA⇒3×108cm=12.5cm9.4cm

Cm=3×9.412.5×108ms−1

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