When is the interference destructive?

When is the interference constructive?

What is the path difference for destructive interfernce?

In Young's double slit experiment what is the shape of interference fringes?

In Young's double-slit experiment deduce the condition for constructive and destructive interference at a point on the screen. Draw the graph showing variation of the resultant intensity in the interference pattern against position 'X' on the screen.

What happens to the interference pattern,when one of the slits is closed?

if one of two identical slits producing interference in Young's experiment is covered with glass, so that the light intensity passing through it is reduced to 50% find the ratio of the maximum and minimum intensity of the fringe in the interference pattern.

What is interference of light?