Question

A bird is flying at the height 3m above the river surface while a fish is 4m below the surface. At what depth would the fish appear to the bird ? At what height the bird would appear to the fish ? (given nwa = 4/3)
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Answer 1

$GIVEN:-$

• A bird is flying at the height 3m above the river surface
• A fish is 4m below the river surface
• $n_{wa}= \frac{4}{3}$

$TO\:FIND:-$

• At what depth would the fish appear to the bird ?
• At what height the bird would appear to the fish ?

$SOLUTION:-$

➊ Depth of fish appear to the bird

Here $n_{wa}=\dfrac{4}{3}\:\therefore\:h_{aw}=\dfrac{3}{4}$

★ Apparent depth of fish:

$\implies\:\:n_{aw}\: \times\:$ Real depth of fish

$\implies\:\: \dfrac{3}{4}\times 4$

$\implies\:\: {\boxed{3m}}$

➋ Height of bird appear to the fish

★ Apparent height of bird

$\implies\:\:n_{wa}\: \times\:$ Real height of bird

$\implies\:\: \dfrac{4}{3}\times 3$

$\implies\:\: {\boxed{4m}}$