A coin at the bottom of a trough containing water to a depth of 15 cm appears to be 3.75 cm raised above from the bottom. Calculate the refractive index of water.

A small bulb (assumed to be a point source) is placed at the bottom of a tank containing water to a depth of 80 cm . Find out the area of the surface of water through which light from the bulb can emerge. Take the value of refractive index of water to be 4//3 .

A small bulb (assumed to be a point source) is placed at the bottom of a tank containing water to a depth of 80 cm . Find out the area of the surface of water through which light from the bulb can emerge. Take the value of refractive index of water to be 4//3 .

A coin is placed at the bottom of a beaker containing water (refractive index=4/3) at a depth of 12cm. By what height the coin appears to be raised when seen from vertical above ?

A coin is placed at the bottom of a glass trough containing water (refractive index = 4/3 ) up to a height 20 cm. At what depth it will appear when it is viewed from air, vertically above the coin. Draw a suitable ray diagram in support of your answer.

Raise in water level problems : A cylinderical tub of radius 12 cm contains water to a depth of 20cm. A spherical form ball of a radius 9 cm is dropped into the tub and thus the level of water is raised by H cm. What is the value of H?

A plane mirror is fixed at the bottom of a tank containing water. A small object is kept at a height of 24 cm from the bottom and is viewed from a point vertically above it. The distance between the object and the image in the mirror as appears to the person is

A concave mirror of radius of curvature h is placed at the bottom of a tank containing a liquid of refractive index mu upto a depth d. An object P is placed at height h above the bottom of the miror. Outside the liquid, an observer O views the object and its image in the mirror. The apparent distance between these two will be

A thin equiconvex lens of refractive index 3//2 is placed on a horizontal plane mirror as shown in figure. The space between the lens and the mirror is filled with a liquid of refractive index 4//3 . It is found that when a point object is placed 15 cm above the lens on its priincipal axis, the object coincides with its own image. Q. If another liquid is filled instead of water, the object and the image coincide at a distance 25 cm from the lens. Calculate the refractive index of the liquid.

A vesserl contains a slab of glass 8cm thick and of refractive index 1.6 . Over the slab, the vessel is filled by oil of refractive index mu upto height 4.5 cm and then by another liquid, i.e., water of refractive index 4//3 and height 6cm as shown in Figure. An observer looking down from above observer that a mark at the bottom of glass slab appears to be raised up to a position 6cm from bottom of the slab. Find refractive index of oil (mu) .

A point source of light is placed at the bottom of a water lake. If the area of the illuminated circle on the surface is equal to 3 times the square of the depth of the lake. The refractive index of water is