Two slits separated by a distance of d = 0.110 mm are located at a distance of D

Question

Two slits separated by a distance of d = 0.110 mm are located at a distance of D = 2.41 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 ? = 555 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. What is the path length difference between the waves at the first maximum (m=1) on the screen?

Explanation / Answer

The path length difference is:

r=m* = 1*555 nm = 555 nm

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