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

Why interference pattern not detected when two coherent sources are far apart.

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

Which coherent sources produce fine interference?

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:No interfernce pattern is observed,when two coherent source are infinetely close to each other. Reason:The fringe width is inversely proportional to the istance betwen the two slits.