When 633-nm light shines on a
fracture-line crack in a thin piece of metal, a diffraction pattern
is observed on a screen located L = 0.90 m
from the metal.
width of the crack = a= m*lambda*L/w
where L= screen distance, w =width of central bright fringe , m=1
a= (633*10^-9*0.9)/0.012 = 47.5 micro-meter
When 633-nm light shines on a fracture-line crack in a thin piece of metal, a diffraction...
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