Question

The diffraction pattern shown in the figure is produced by passing laser light (λ = 680...

The diffraction pattern shown in the figure is produced by passing laser light (λ = 680 nm) through a single slit and viewing the pattern on a screen 2.55 m behind the slit. What is the width of the slit if the distance between the dashed lines is 25.2 cm?

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Answer #1

y = nD/d

where y = distance between the dashed lines

D = distance from the screen

d = width of the slit , = wavelenght of the light

2.55 = 1*680*10^-9*0.252  / d

d = 6.72*10^-8 m

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