A 10 cm long fish lies horizontally at a depth of 4 cm under water. If observed from air above water how long will the fish appear to be?

A man observe a fish at a depth of 6 cm from the surface of water in a pond. To hunt the fish, at what depth will he have to through the spear? Refractive index of water = (4)/(3) .

Analyze how fish can float in a partciular depth of water and can move in various water level.

A beaker contains mercury to a depth of 4 cm and above it there is water of depth 12 cm. What is the total pressure acting on the bottom of the beaker? [density of mercury = 13.6g*cm^(-3) , atmospheric pressure = 76 cm of mercury]

There is a mark at the bottom of a beaker. A liquid of refractive index 1.4 is poured into it. If the depth of the liquid is 3.5 cm then determine how much will the mark appear to rise when it is viewed from above?

An air bubble of volume 20cm^3 forms in a lake at a depth of 40 m below the water surface.What will be its volume when it rises just below the water surface?(Standard atmospheric pressure=76 cmHg)

In a beaker partly filled with water, the depth of water seems to be 9cm. On pouring more water in it, the real depth of water is increased by 4cm. Now the apparent depth of water seems to be 12 cm. Determine the refractive index of water and initial depth of water in the beaker.

A rubber ball of mass 10 g and radius 2 cm is submerged in water up to a depth of 5 cm and released. Find the height up to which the ball pops up above the surface of water, neglecting the resistance of water and air. The density of water = 1g*cm^(-3) .