Question

A bird is flying at the height 3 m above the river surface while a fish is 4 m below the surface. At what depth would the fish appear to the bird ? At what height the bird would appear to fish ?

Answer 1

Answer: The correct answers are 8 m and 7 m.

Explanation:

The expression for the refractive index in terms of apparent depth in air is as follows;

$\mu =\frac{Apparent depth in air}{Real depth in air}$

Put $\mu=\frac{4}{3}$ and Real depth in air= 3 m.

$\frac{4}{3} =\frac{Apparent depth in air}{3}$

$Apparent depth in air=4 m$

The fish would see the bird at 4+4 = 8 m.

The bird would see the fish at 3 m + 4 m= 7 m.

Therefore, the fish would appear to the bird at depth of  8 m. The bird would appear to fish at the height of  7 m.