In the figure, a light wave along ray r1 reflects once from a mirror a

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In the figure, a light wave along ray r1 reflects once from a mirror and a light wave along ray r2 reflects twice from that same mirror and once from a tiny mirror at distance L from the bigger mirror. (Neglect the slight tilt of the rays.) The waves have wavelength 480. nm and are initially exactly out of phase. What is the smallest value of L that results in the final waves being exactly in phase? 600. nm 120. nm 240. nm 480. nm 360. nm

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In the figure, a light wave along ray

r_{1}

reflects once from a mirror and a light wave along ray

r_{2}

reflects twice from that same mirror and once from a tiny mirror at distance

L

from the bigger mirror. (Neglect the slight tilt of the rays.) The waves have wavelength

480 . n m

and are initially exactly out of phase. What is the smallest value of

L

that results in the final waves being exactly in phase? 600. nm 120. nm 240. nm 480. nm 360. nm

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$Assume that two waves of light in air, of wavelength 480. nm, are initially π rad out of phase. One travels through a glass layer of index of refraction n1 = 1.45 and thickness L. The other travels through an equally thick plastic layer of index of refraction n2 = 1.65. What is the smallest value of L so that the waves end up exactly in phase once they pass through the two media? 1.20 × 103 nm 300 nm 480 nm 1.80 × 103 nm 960 nm$

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