answer 1) we know the formula slit diffraction
sin=/D
=sin-1(/D)=sin-1(426/0.3)=0.08136o
we have ,
tan=y/L
y=L*tan=2.8*tan0.08136=0.004 m
the distance between first minima=2y=2*0.004=0.008 m=8.00 mm
so the answer is 8.0 mm
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