Answer :
(i)Height of water container h= 20 cm
Ceiling of the room is 2.0 m above the water surface.
Radius of the rubber ring= r
Refractive index of water
From the figure we can say that;
By applying Snell’s law, we get;
⇒
From the figure, we get;
So,
⇒
⇒
⇒
⇒
So, the total radius of the shadow =
(b)For Maximum angle of refraction, angle of incidence should be equal to critical angle i.e.
Let R is the maximum radius.
Now,
⇒
⇒
⇒
⇒
⇒ .
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