21. Light from a He-Ne laser ( = 632.8 nm) strikes a pair of slits at normal inc

Question

21. 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 1.40 m from the slits. Figure 28-34 shows the interference pattern observed on the screen. What is the slit separation? Picture the Problem: The figure shows interference pattern for light with wavelength 632.8 nm on a screen that is 1.40 m from the double slits The separation distance between the minima m and (m + 4) is 23.0 mm. 230 mm Strategy: Since 23.0 mm is much smaller than the 1.40 m distance to the screen, use the small angle approximations tan sin Use equation 28-2 to calculate the angles for the minima of order m and (m + 4). Use equation 28-3 to calculate the location of the minima. Set the difference equal to the 23.0 mm and solve for the slit separation distance Solution: 1 Calculate the angles for minima of

Explanation / Answer

in the figure the seperation distance (23.0 mm) is the distance between dark to dark

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