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Intensity Explanation in YDSE

The two sourc...

Question

The two sources of light should be close to each other for the production of the steady interference pattern. Why?

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Solution

If the sources emit light waves of more than onewavelength (frequency) then constructive Interference or
brightness at a point due to one may overlap with destructive Interference or darkness due to the other wavelength. ... Therefore, the two coherent sources of light should be monochromatic

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Q. The necessary conditions for a steady and stable interference pattern, produced by two sources of light, are,

(i)

two light sources must emit waves of equal frequency

(i i)

two point sources should have the same amplitude

(i i i)

two sources must have constant phase difference

(i v)

two sources must be close to each other

What are the coherent sources of light and why do we need coherent sources for the production of interference pattern ?

Q. Assertion: No interference pattern is detected when two coherent sources are infinitely close to each other.
Reason : The fringe width is inversely proportional to the distance between the two slits.

Q. To obtain an interference pattern, the necessary condition is that the two sources should be,

Q. Assertion :In YDSE, if separation between the slits is less than wavelength of light, then no interference pattern can be observed. Reason: For interference pattern to be observed, light sources have to be coherent.

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