(1) In Single Slit Diffraction,For Destructive
interference
,where a=slit width,m=order of minimum,
,
angle from original direction of light to mth minima.
It is given that
682 nm,
,10th
dark fringe,m=10
So
(682x10x10-9/54x10-6)=sin-1(126.29x10-3)
=0.12629
(2) If we take maximum value of
,then
so if we replace green laser with,red laser of longer wavelength
then
increase and m decrease.
so no. of dark spots on wall will decrease,since bright spots falls between dark spots,no. of dark spots on spot will decrease.
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