State the conditions for constructive and destructive inter-ference of light.

State the conditions to get constructive and destructive interference of light.

What are coherent sources ? Define interfernece of light. Obtain the condition for constructive and destructive interference of light .

Defive the condition for constructive and destructive interference.

Describe the condition for constructive and destructive interfernce.

What is constructive and destructive interference?

Derive an expression for path difference in Young' s double slite experiment and obtain the conditions for constructive and destructive inteference at a point on the screen.