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Q.

A fish 40 cm beneath the surface of pond sees a bird directly over head. If the bird is actually 15 cm above the water surface, the same appears to be seen by the fish above the water surface at a height of $(μ = \frac{4}{3})$

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a

30 cm

b

20 cm

c

25 cm

d

10 cm

answer is B.

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Detailed Solution

R .D = 15 cm

$μ = \frac{4}{3}$

$A .D = ?$

$μ = \frac{A .D}{R .D}$

$A .D = μ \times R .D$

$= \frac{4}{3} \times 15 = 20 cm$

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A fish 40 cm beneath the surface of pond sees a bird directly over head. If the bird is actually 15 cm above the water surface, the same appears to be seen by the fish above the water surface at a height of (μ=43)