^Position of maxima

^Position of maxima

Also it is found that at P for nth maxima

In a similar way the angular position of nth bright fringe is

i.e. angular positions of 1st, 2nd, 3rd maxima are

From above relation we can say that each secondary maxima occupies an angular width of , thus linear width of each secondary maxima is . As the central maxima is a spread between the angular positions to , thus its angular width is i.e. central maxima is twice wider than secondary maxima. Linear width of central maxi. is 

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