State conditions which must be satisfied for two light sources to be coherent.

State two conditions for two light sources to be coherent. Derive an expression for the fringe width in Young.s double slit experiment for interfernce with suitable diagram.

What is the condition to be satisfied for a compound to be chiral ?

State the essential conditions for two light waves to be cohrent.

Write two conditions which lead to guttation.

State the conditions under which a force does no work.

State any two conditions essential for good health.