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(a) Why are coherent sources necessary t...

(a) Why are coherent sources necessary to produce a sustained interference pattern ?
(b) In Young's double slit experiment using monochromatic light of wavelength `lamda`, the intensity of light at a point on the screen where path difference is `lamda`, is K units. Find out the intensity of light at a point where path difference is `lamda//3`.

A

`K/2`

B

2K

C

4K

D

`K/4`

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The correct Answer is:
D
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(a) Why are coherent sources necessary to produce a sustained interference pattern ? (b) In Young's double slit experiment using mono-chromatic light of wavelength lambda the intensity of light at a point on the screen where where path difference is lambda, is K units. Find out the intensity of light at a point where path difference is (2lambda)/(3)

In Young's double slit experiment using monochromatic light of wavelength lambda , the intensity of light at a point on the screen where path diff. is lambda is K units. Find the intensity of light at a point where path difference is lambda//3 .

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