refractive index of
themedium      ? = sin i /
sinr
              i
= 45 , r = ?
                                                 1.33
= sin 45 / sin?
                                                sin?
= sin 45 /1.33
                                                       Â
? =32.2820Â Â Â Â is the angle
ofrefraction .
b) from
thefigure           tan
45 = Â Â Â 2.1
/  x Â
                                   Â
X =
2.1Â Â Â Â Â Â Â Â
                     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.
