ONLY need help with number 3! A set of narrow vertical slits is located a distan

Question

ONLY need help with number 3!

A set of narrow vertical slits is located a distance D from a screen. The slits are equally spaced and have the same width. The intensity pattern in the figure is observed when light from a laser passes through the slits, illuminating them uniformly. The screen is perpendicular to the direction of the light. Data: Distance to the screen = 2.83 m, Wavelength of light = 470 nm, Distance between tick marks on the intensity figure = 1.80 cm.
1. What is the spacing between the slits? Answer is 7.540

Explanation / Answer

y' = lambda*L/d'

d' = 4d

y' = lambda*L/4d

y' = y/4 = 1.80/4 = 0.45 cm

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