Column-I Column-II
A) If Young's double slit experiment is performed in water instead of air then the fringe pattern will P) equal
B) If the distance between slits in YDSE is reduced, the fringe width will Q) decrease
C) If blue light is used instead of red light in YDSE, the fringe width will R) increase
D) For best contrast between maxima and minima in the interference pattern of Young's double slit experiment the intensity of light emerging out of the two slits should be S) shrink

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$A - s; B - r; C - p; D - q$

$A - s; B - r; C - q; D - p$

$A - r; B - s; C - q; D - p$

$A - r; B - s; C - p; D - q$

answer is A.

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Detailed Solution

A-s; B-r; C-q; D-p
(B) For maxima, $Δ x = n λ$
$\cos θ = n,$

Possible values of $n = 0, 1$

$\cos θ = 0, \Rightarrow θ = 90^{°}, 270^{°} \cos θ = 1, \Rightarrow θ = 0^{°}, 360^{°}$

$∴$ Number of maximas $= 4$
Similarly for minimas, $Δ x = (2 n - 1) \frac{λ}{2}$

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	Column-I		Column-II
A)	If Young's double slit experiment is performed in water instead of air then the fringe pattern will	P)	equal
B)	If the distance between slits in YDSE is reduced, the fringe width will	Q)	decrease
C)	If blue light is used instead of red light in YDSE, the fringe width will	R)	increase
D)	For best contrast between maxima and minima in the interference pattern of Young's double slit experiment the intensity of light emerging out of the two slits should be	S)	shrink