The figure shows the light
intensity on a screen behind a single slit. The wavelength of the
light is 520 nm and the screen is 1.1 m behind the slit. What is
the width (in mm) of the slit?
from the figure
width of slit w = 2cm - 1cm = 1cm
= 0.01m
wave length of ligth λ = 520nm
= 520 * 10-9 m
distance between slit and screen L = 1.1m
width of the brigth central maximum is given by formula
w = 2λL/a
a = 2λL/w
= 2 * 520 * 10^-9m * 1.1m/ 0.01m
= 0.114mm
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