1. A set of narrow vertical slits is located a distance D from a screen. The sli
ID: 1508463 • Letter: 1
Question
1. 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. What is the spacing between the slits?
Data: Distance to the screen = 2.77 meters;
Wavelength of light = 470 nanometers;
Distance between tick marks on the intensity figure = 1.90 centimeters
Explanation / Answer
distance between 2 bright fringe = 1.90 cm = 1.9*10^-2 m
usE:
distance betwen fringes = lambda*D/d
1.9*10^-2 = (470*10^-9)*2.77/d
d = 6.85*10^-5 m
Answer: 6.85*10^-5 m
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