" Why no interference pattern is observed when two coherent sources are too close? "

What are coherent source of light? Why no interference pattern is observed when two coherent source are too close

What are coherent sources of light ? Why nointerference pattern is observed when two coherent sources are (i) too close (ii) very far apart ?

What are coherent sources of light? Why no interference pattern is observed when two coherent sources are very for apart?

Why there is no interference pattern observed when two coherent sources are placed far apart?

No interference pattern is detected when two coherent sources are infinitely close to each other. Why?

No interference pattern is detected when two coherent sources are infinitely close to each other. Why?

What is interference of light? Write two essential conditions for sustained interference pattern to be produced on the screen. Why interference pattern is not detected when two coherent sources are far apart?