002 10.0 points A laser beam of wavelength 631.9 nm is incident on two slits 0.2
ID: 1288686 • Letter: 0
Question
002 10.0 points A laser beam of wavelength 631.9 nm is incident on two slits 0.24 mm apart. How far apart are the bright interference fringes on a screen 6.32 m away from the double slits? Answer in units of cm 003 (part 1 of 2) 10.0 points A pair of narrow, parallel slits separated by a distance of 0.253 mm are illuminated by the green component from a mercury vapor lamp of wavelength 546.5 nm. The interference pattern is observed on a screen 1.5 m from the plane of the parallel slits. 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 004 (part 2 of 2) 10.0 points Find the distance between the first and second dark bands in the interference pattern. Answer in units of mmExplanation / Answer
deltaybright = lambda * L / d
= 631.9 * 10-9 * 6.32 / (0.24 * 10-3)
= 1.66 cm
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deltay = lambda * L / d
= 546.5 * 10-9 * 1.5 / (0.253 * 10-3)
= 3.24 * 10-3 m = 3.24 mm
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The distance between the first and second dark bands can be determined
deltay = ydark(m=1) - ydark(m=0)
= [lambda * L / d](1 + 1/2) - [lambda * L / d](0 + 1/2) = lambda * L / d
= 3.24 mm
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