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**1. Homework Statement**

A man holds a light that emits light of wavelength λ. The light beam passes though a pair of slits separated by a distance d, in a screen plate attached to the front of the light beam(double slits experiment). The beam then falls perpendicularly on a screen, getting an interference pattern on it. The man walks straight toward the screen at speed v. The central maximum on the screen is stationary. Find the speed of the 2nd-order maxima on the screen, where m can be very large. (Use variable or symbol )

**2. Homework Equations**

y=[tex]\lambda[/tex]L m / d

**3. The Attempt at a Solution**

L changes with v, and y changes with v

so y = [tex]\lambda[/tex] v t m /d

then v 2nd order maximum (m=2) = y' = [tex]\lambda[/tex] v m /d

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**