A mark is made on the bottom of beaker and a microscope is focussed on it. The microscope is raised through `1.5 cm`. To what height water must be poured into the beaker to bring the mark again into focus ? Given that `mu` for water is `4//3`.

A microscope is focussed on a coin lying at the bottom of a beaker. The microscope is now raised up by 1 cm . To what depth should the water be poured into the beaker so that coin is again in focus ? (Refration index of water is 4//3 )

A mark at the bottom of a bekar is focussed by a microscope .When water is poured in the beaker up to a height of 16 cm,the microscope has to be raised through a distance of 4 cm in order to bring the mark to focus again .Calculate the refractive index of water.

To determine the refractive index of a liquid experimentally, a mark is made on the beaker and a microscope was focussed on it, giving a reading of 3.42 cm. On pouring liquid till a height 2.68 cm inside the beaker, the reading of refocussed microscope is 3.38 cm. Calculate the refractive index of the liquid.

A travelling microscope is focussed on to a scratch on the bottom of a beaker. Water of refractive index (4)/(3) is poured in it. Then the microscope is to be lifted through 2 cm focus it again. Find the depth of water in the beaker.

A microscope is focussed on a dot on the bottom of the beaker. Some oil is poured into the beaker to a height of y cm and it found necessary to raise the microscope through a vertical distance of x cm to bring the dot again into focus. Express refractive index of oil in terms of x and y .

A microscope is focused on a stain on inner bottom of an empty trough. The microscope is leveled and moved 1.4 cm away from the surface. To what height a transparent liquid of refractive index 1.4 should be filled in the trough to focus the stain again.

A mark is made on the bottom of a vessel and over this mark, a glass slab to thickness 3.5 cm and refractive index (7)/(4) is placed. Now water (refractive inidex, (4)/(3)) is poured into the vessel so that the surface of water is 8 cm above the upper surface of the slab. Looking down of normally through the water, the apparent depth of the mark below the surface of water will be :

What is the real depth of a swimming pool when its bottom appears to be raised by 1 m ? Given refractive index of water is 4//3 .