Travelling microscope is used for

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.

Electron microscope is used for

Electron microscope is used for

An electron microscope is used for "_______________"

Which of the following microscope is used to observe Y-chromatin ?

A fluorescence microscope is used to

The least count of a travelling microscope is ________