1062_Physics ProblemsTechnical Physics

1062_Physics ProblemsTechnical Physics - Chapter 37 P37.63...

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Chapter 37 403 P37.63 (a) Constructive interference in the reflected light requires 2 1 2 tm =+ F H G I K J λ . The first bright ring has m = 0 and the 55th has m = 54 , so at the edge of the lens t = × = 54 5 650 10 2 17 7 9 . . m m ej µ . Now from the geometry in Figure 37.18, the distance from the center of curvature down to the flat side of the lens is Rr R t 22 −=− or Rr R R t t 2 2 2 −= − + R rt t = + = ×+ × × = −− 2 2 5 2 5 2 5 00 10 1 77 10 2 1 77 10 70 6 .. . . m m m m (b) 1 1 11 0520 70 6 f n RR =− F H G I K J = F H G I K J af . . m so f = 136 m *P37.64 Light reflecting from the upper interface of the air layer suffers no phase change, while light reflecting from the lower interface is reversed 180°. Then there is indeed a dark fringe at the outer circumference of the lens, and a
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