What is gravity separation ?

What are the various principles used in chromatographic separation?

How does fringe width vary with slit separation?

A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5cm of spirit to the other. What is the specific gravity of spirit?

KCN is used for the separation of :

Chromatography technique is used for the separation :

Give the formula for angular separation of bright and dark fringes.