A beam of light parallel to central line AB is incident on the plane of slits . The number of minima obtained on the large screen is n₁ . Now if the beam is tilted by some angle $(\neq 90 °)$ as shown in figure, then the number of minima obtained is n₂ .Then,

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$n_{2} > n_{1}$

$n_{1} = n_{2}$

$n_{2}$ will be zero.

$n_{1} > n_{2}$

answer is A.

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Detailed Solution

A beam of light parallel to central line AB is incident on the plane of slits . The number of minima obtained on the large screen is n₁ . Now if the beam is tilted by some angle $(\neq 90 °)$ as shown in figure, then the number of minima obtained is n₂ .Then only fringe pattern will shift. Number of fringes on screen will remain unchanged; i.e., $n_{1} = n_{2}$ . Thus, option 1 is correct.