Phase contrast microscopy is

Bring out the significance of phase contrast microscopy

Phase contrast microscope was invented by:

{:(1.,"Compound Microscope",(i),"Ruska"),(2.,"Dark field Microscope",(ii),"Zenrike"),(3.,"Phase contrast Microscope",(iii),"Janse"),(4.,"Electron Microscope",(iv),"Sigmondy"):}

An instrument used for obtaining extremely thin sections for microscopy is

Which of the following techniques, other than microscopy, is used for the study of cell?

Which of the following technique, other than microscopy is used for study of cell?