In: Physics
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refractive index of themedium ? = sin i / sinr
i = 45 , r = ?
1.33 = sin 45 / sin?
sin? = sin 45 /1.33
                                                        
? =32.2820     is the angle
ofrefraction .
b) from
thefigure           tan
45 =    2.1
/  x  
X = 2.1
from which the distance of the person 'x' can bedetermined.
c) if the pool isempty the object must be moved to the distance
d = tan(45 -32.282)* depth of the pool.