Problem%20Set%208%20Solutions

Problem%20Set%208%20Solutions - 13(a We choose a horizontal...

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approximately equal to 1). Thus, combining these phase differences with λ = 0.600 µ m, we have ( ) ( ) ( ) ( ) 2 1 2 2 1 1 3.50 m 4.00 m 3.50 m 1 1.60 1.40 1 1.40 0.600 m 0.600 m 0.833. L L L n n n µ µ µ λ λ µ µ + = + = (b) Since the answer in part (a) is closer to an integer than to a half-integer, the interference is more nearly constructive than destructive. 13. (a) We choose a horizontal x axis with its origin at the left edge of the plastic. Between x = 0 and x = L 2 the phase difference is that given by Eq. 35-11 (with L in that equation replaced with L 2 ). Between x = L 2 and x = L 1 the phase difference is given by an expression similar to Eq. 35-11 but with L replaced with L 1 L 2 and n 2 replaced with 1 (since the top ray in Fig. 35-37 is now traveling through air, which has index of refraction
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