A container contains water upto a height of 20 cm and there is a point source at the centre of the bottom of the container. A rubber ring of radius r floats centrally on the water. The ceiling of the room is 2.0 m above the water surface. Keeping the radius of ring 15cm,th level of water in liquid is varied.When the level of liquid becomes h,the shadow of the ring disappears.the value of h is?
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A container contains water upto a height of 20 cm and there is a point source at the centre of the bottom of the container. A rubber ring of radius r floats centrally on the water. The ceiling of the room is 2.0 m above the water surface. Keeping the radius of ring 15cm,th level of water in liquid is varied.When the level of liquid becomes h,the shadow of the ring disappears.the value of h is?
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