Question

A pile 4m high driven into the bottom of a lake is 1m above the water . Determine the length of the shadow of the pile on the bottom of the lake if the sun rays make an angle of 45^@ with the water surface . The refractive index if water is 4/3.

Answer 1

Here is your answer:

Explanation:

Solution :

From Snell's law,

4/3=sin45°/sin r

Solving this equation , we get

r=32°

Further,

EF=(DF) tanr=(3)tan32°

=1.88m

Total length of shadow, L=CF or L=(1+1.88)m

=2.88m

Answer 2

Explanation:

please refer above attachment