A pair of narrow, parallel slits separated by a distance of 0.235 mm are illumin

ID: 2265243 • Letter: A

Question

A pair of narrow, parallel slits separated by a

distance of 0.235 mm are illuminated by the

green component from a mercury vapor lamp

of wavelength 546.9 nm. The interference

pattern is observed on a screen 1.02 m from

the plane of the parallel slits.

a) Find the distance from the central maxi-

mum to the first bright region on either side

of the central maximum.

Answer in units of mm

b) Find the distance between the first and second

dark bands in the interference pattern.

Answer in units of mm

distance of screen =L=1.02 m

wavelength=lambda=546.9 nm

distance between slits=d=0.235 mm

a)distance from central maximum to first bright region =lambda*D/d=2.4 mm

b)distance between first and second dark band=2.4 mm

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