1 . Monochromatic light (? = 630 nm) strikes a pair of slits at normal incidence

Question

1. Monochromatic light (? = 630 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.10 m from the slits. The figure shows the interference pattern observed on the screen. What is the slit separation?

1. Monochromatic light (? = 630 nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.10 m from the slits. The figure shows the interference pattern observed on the screen. What is the slit separation? m

Explanation / Answer

The 23mm distance covers 4 fringes, so we can use m=4 in the formula for fringe separation:

ym=Rm lamda/d

Ym=(1.10)*4*630*10^-9m/23*10^-3m

=2772*10^-9/23*10^-3m

=120.5*10^-6m

Ym=1.20*10^-4m

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