Problem 24.06 Part A A red laser from the physics lab is marked as producing 632

Question

Problem 24.06 Part A A red laser from the physics lab is marked as producing 632.8-nm light. When light from this laser falls on two closely spaced slits, an interference pattern formed on a wall several meters away has bright red fringes spaced 6.00 mm apart near the center of the pattern. When the laser is replaced by a small laser pointer, the fringes are 6.13 mm apart. What is the wavelength of light produced by the pointer? Express your answer to three significant figures and include the appropriate units. ? Value Units Submit My Answers Give Up

Explanation / Answer

frindge width = D * lambda / d

D / d = y / lambda

D/d = y1 / lambda1

D/d = y2 / lambda2

y1 / lambda1 = y2 / lambda2

lambda2 =  lambda1 / y1 * y2

= (632.8 * 10-9 / 6.00 * 10-3) *6.13 * 10-3

lambda2 = 6.46 * 10-7 m = 646 nm

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