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In Fig. 35-32, a light wave along ray r 1 reflects once from a mirror and a ligh

ID: 1677765 • Letter: I

Question

In Fig. 35-32, a light wave along ray r1reflects once from a mirror and a light wave along rayr2 reflects twice from that same mirror andonce from a tiny mirror at distance L from the biggermirror. (Neglect the slight tilt of the rays.) The waves havewavelength 474 nm and are initially in phase. (a)What is the smallest value of L that puts the final lightwaves exactly out of phase? (b) With the tinymirror initially at that value of L, how far must it bemoved away from the bigger mirror to again put the final waves outof phase?

Explanation / Answer

a 2d=(1/2) =>.d=/4 b 2d=(3/2) => d'=3/4 d=d'-d=/2

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