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

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

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

General instruction same as in chapter 1. Assertion: No interference pattern is detected when two coherent sources are infinitely close to each other. Reason:The Fringe width is inversly proportional to the distance between the two slits and a singel fringe may occupy the whole screen.

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.

State three characteristic which distinguish interference pattern due to two cohrently illuminated sources as compard to that observed in a diffraction pattern due to a single slit.

What happens to the interference pattern if phase difference between two light sources varies continuously?

Two identical coherent waves, each of intensity 'I', are producing an interference pattern. Find the value of the resultant intensity at a point constructive interference.