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  • For Young's double slit experiment, two statements are given below: Statement I : If screen is moved away from the plane of slits, angular separation of the fringes r

For Young's double slit experiment, two statements are given below:

Statement I : If screen is moved away from the plane of slits, angular separation of the fringes remains constant.

Statement II : If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

In the light of the above statements; choose the correct answer from the options given below:

Option: 1

Both Statement I and Statement II are true.


Option: 2

Both Statement I and Statement II are false.


Option: 3

Statement I is true but Statement II is false.


Option: 4

Statement I is false but Statement II is true.


Answers (1)

\because \theta \text { (angular fringe width })=\frac{\lambda}{d}

(i) In statement I : \text { if } \mathrm{D} \uparrow \text { then } \theta \rightarrow \text { same }

(ii) In statement II : \text { if } \lambda \uparrow \text { then } \theta \uparrow

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Ramraj Saini

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