Answer :

33.PNG


(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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