33_Ch 24 College Physics ProblemCH24 Wave Optics

33_Ch 24 College Physics ProblemCH24 Wave Optics - Wave...

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Wave Optics 335 Thus, () 2 22 2 12 2 tan sin 1 sin 2 cos sin cos nt nt nt 2 δ θθ θ  = =   The condition for constructive interference is then ( ) 2 2c o s 1 2 nt m λ =+ =− (b) When 1 30.0 = , then ° ( ) 11 2 1.00 sin30.0 sin sin 21.2 1.38 n −− ° == 0 m sin n = ° For minimum thickness, = which gives a thickness of ( ) 2 01 2 59 115 nm 2 cos 4 1.38 21.2 t n + = ° 0 nm cos 24.70 The indirect ray suffers a phase reversal as it reflects from the mirror, but there is no reversal for the direct ray. Therefore, the condition for constructive interference, with the two sources separated by distance 2 d , is 1 2s i n 2
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This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.

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