Two slits separated by a distance of d = 0.120 mm are located at a distance of D

Question

Two slits separated by a distance of d = 0.120 mm are located at a distance of D = 2.16 m from a screen. The screen is oriented parallel to the plane of the slits. The slits are illuminated by a monochromatic and coherent light source with a wavelength of ? = 618 nm. A wave from each slit propagates to the screen. The interference pattern shows a peak at the center of the screen (m=0) and then alternating minima and maxima. At what angle from the beam axis will the first (m=1) maximum appear? (You can safely use the small angle approximation.)

Explanation / Answer

d = 0.120 mm, D = 2.16 m, = 618 nm. Find 1

dsin1 =

1 = sin-1(/d) = 0.295o

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