Answer:
a) 2.25 m
b) 2.625 m
Explanation:
Refraction is the name given to the phenomenon of the speed of light changing the the boundary when it moves from one physical medium to the other.
Refractive index is the ratio of the speed of light in empty vacuum (air is an appropriate substitution) to the speed of light in the medium under consideration.
In terms of real and apparent depth, the refractive index is given by
η = (real depth)/(apparent depth)
a) Real depth = 3.00 m
Apparent depth = ?
Refractive index, η = 1.333
1.333 = 3/(apparent depth)
Apparent depth = 3/1.3333 = 2.25 m.
Hence the bottom of the pool appears to be 2.25 m below the ground level.
b) Real depth = 1.5 m
Apparent depth = ?
Refractive index, η = 1.333
1.3333 = 1.5/(apparent depth)
Apparent depth = 1.5/1.3333 = 1.125 m
But the pool is half filled with water, there is a 1.5 m depth on top of the pool before refraction starts.
So, apparent depth of the pool = 1.5 + 1.125 = 2.625 m below the ground level
