Homework Answers
minima for single slit diffraction :
d*sintheta = m*lambda
tan theta = y/D
theta is small so tantheta = sintheta
d*y/D = m*lambda
d = slit width
D = screen distance
y = minima fromcentral
m = 1 ,2 , 3 ...
lambda = wavelenght
d = m*lambda*D/y
m =2
d = 1.38 x 10^-4 m = 0.138 mm
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