Glycerine (refractive index 1.4) is poured into a large jar of radiys 0.2m to a depth of 0.1m. There is a small light source at the centre of the bottom of the jar. Find the area of the surface of glycerine through which the light passes.

A liquid of refractive index 1.5 is poured into a cyclindrical jar of radius 20 cm upto a height of 20 cm. A small bulb at the centre of bottom glowing. Find area of the liquid surface through which the light of the bulb passes into air.

A point source of light is 80.0cm below the surface of a body of water. Find the diameter of the circle at the surface through which light emerges from the water.

A horizontal cylindrical tank is half full of water ( refractive index =(4)/(3)) . The space above the water is filled with a light liquid of unknown refractive index (mu) . A small laser source (s) can move along the curved bottom of the cylinder and aims a light beam towards the centre of the cylinder. The time needed by the laser beam to travel from the source to the rim of the cylinder depends on position (theta) of the source as shown in the graph. Find mu , it is given that sin theta_(0) = (5)/(6) .

A point source of monochromatic light 'S' is kept at the centre of the bottom of a cylinder of radius 15.0 cm . The cylinder contains water (refractive index 4//3) to a height of 7.0 cm . Draw the ray diagram and calculate the area of water surface through which the light emerges in air.

A point source of monochromatic light 'S' is fept at the centre of the bottom of a cyclinder of radius 15.0 cm . The cyclinder contains water (refractive index 4//3 ) to a height of 7.0cm . Draw the ray diagramand caculate the area of water surface through which the light emerges in air.

Refractive index of water is 5//3 . A light source is placed in water at a depth of 4m. Then what must be the minimum radius of disc placed on water surface so that the light of source can be stopped?

A horizontal cylinderical tank (6)/(pi)m in diameter is half full of water. The space above the water is filled with a pressurized gas of unknown refractive index. A small laser can move along the curved bottom of the water and aims a light beam towards the centre of the water surface. When the laser has moved a distance s=1m or more (measured from curved face) from the lowest point in water, no light enters the gas. The refractive index of gas is (mu_("water") = 4//3)

A girl sees through a circular glass slab (refractive index 1.5 ) of thickness 20 mm and diameter 60 cm to the bottom of a swimming pool. Refractive index of water is 1.33 . The bottom surface of the slab is in contact with the water surface. The depth of swimming pool is 6m. The area of bottom of swimming pool that can be seen through the slab is approximately -