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  4. A fish at a depth of 12 cm in water is viewed by an observer on the bank of a lake. To what height the image of the fish is raised? (Refractive index of lake water = 4/3)

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Q. A fish at a depth of $12\, cm$ in water is viewed by an observer on the bank of a lake. To what height the image of the fish is raised? (Refractive index of lake water $= 4/3$)

WBJEEWBJEE 2007

Solution:

Apparent rise $=d\left(1-\frac{1}{a \mu_{w}}\right)$
$=12 \times\left(1-\frac{3}{4}\right)$
$=12 \times \frac{1}{4}=3\, cm$