Light from a He-Ne laser ( ? = 632.8 nm ) strikes a pair of slits at normal inci

Question

Light from a He-Ne laser ( ? = 632.8 nm ) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.90m from the slits. The figure(Figure 1) shows the interference pattern observed on the screen.

What is the slit separation?

Light from a He-Ne laser ( ? = 632.8 nm ) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.90m from the slits. The figure(Figure 1) shows the interference pattern observed on the screen. What is the slit separation?

Explanation / Answer

y = m*lamda*L/d...

slit seperation d = m*lamda*L/y = 4*632.8*10^-9*1.9/23*10^-3 = 0.209 mm

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