A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

The refractive index of water is 1.33.What will be the speed of light in water?

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of- refracted light. Refractive index of water is 1.33

A concve mirror of radius of curvature 1 m is placed at the bottom of a tank of water.The mirror forms an image of the sun,when it is directly overhead.Calculate the distance of the images from the mirror for different depths,80 cm and 40 cm of the water in the tank.

A convex lens has 10 cm focal length in air.What is its focal length in water? (Refractive index of air-water is 1.33, refractive index for air glass = (1.5)

A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?

A glass slab of thickness 4 cm contains the same number of waves as 5 cm of water,when both are traversed by the same monochromatic light.If the refractive index of water is 4//3 ,what is the refractive index of glass?

A convex lens has 12 cm focal length in air. What is its focal length in water? (Refractive index of air-water is (1.33) , refractive index for air-glass = (1.5) .