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1 . Monochromatic light (? = 660 nm) strikes a pair of slits at normal incidence

ID: 1376275 • Letter: 1

Question

1. Monochromatic light (? = 660 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.78 m from the slits. The figure shows the interference pattern observed on the screen. What is the slit separation? 1. Monochromatic light (? = 660 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.78 m from the slits. The figure shows the interference pattern observed on the screen. What is the slit separation?

Explanation / Answer

sin(theta) = y/L = 23*10^-3/1.78 = 0.01292

d = n*lambda/sin(theta) = 4*660*106-9/0.01292 = 204.33*10^-6 m = 204.33 um

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