Question

$\large\mathbb \pink{\fcolorbox{pink}{black}{ QUESTION \ }}$

(a) State the importance of coherent sources in the phenomenon of interference.✌️

(b) In Young’s double slit experiment to produce interference pattern, obtain the

conditions for constructive and destructive interference. Hence, deduce the expression✌️

for the fringe width.

(c) How does the fringe width get affected, if the entire experimental apparatus of Young ✌️

is immersed in water?​

Answer 1

Answer:

A option is correct

Hope this ans is helpful for you

Answer 2

Answer:

$\rm \red{Here \: is \: your \: Answer}$

1) If coherent sources are not taken, the phase difference between two interfering waves, will change continuously and a sustained interference pattern will not be obtained. Thus, coherent sources provide sustained interference pattern.

(Refer to the 1st attachment}

1 ,S, and 2 are the two slits, d is the distance between slits, PM is the screen where pattern will be observed and D is the distance between slits and screen.

{Refers to the second attachment}

c.If the Young's apparatus is immersed in water, the effect on fringe width will be narrower. The wavelength of light is less in water than in air. Hence, the fringe width will decrease.

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