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  4. There are two sources kept at distances 2 λ. A large screen is perpendicular to line joining the sources. Number of maximas on the screen in this case is (λ= wavelength of light).

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Q. There are two sources kept at distances $2 \lambda$. A large screen is perpendicular to line joining the sources. Number of maximas on the screen in this case is $(\lambda=$ wavelength of light).Physics Question Image

BITSATBITSAT 2017

Solution:

for max. path diff $\Delta =n \pi: n=0,1,2$, .
$\therefore $ as shown in figure, there are 5 positions
where $\Delta x=n \lambda$ satisfied
no. of maxima $=5$