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17_Ch 24 College Physics ProblemCH24 Wave Optics

17_Ch 24 College Physics ProblemCH24 Wave Optics - Wave...

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Wave Optics 319 24.30 (a) Dark bands occur where ( ) sin m a θ λ = . At the first dark band, , and the distance from the center of the central maximum is 1 m = ( ) 1 9 3 3 tan sin 600 10 m 1.5 m 2.25 10 m 2.3 mm 0.40 10 m y L L L a λ θ θ = = × = = × × = (b) The width of the central maximum is ( ) 1 2 2 2.25 mm 4.5 mm y = = 24.31 (a) Dark bands (minima) occur where ( ) si . For the first minimum, n m a θ λ = 1 m = and the distance from the center of the central maximum is ( ) 1 tan sin y L L a θ θ λ = L = . Thus, the needed distance to the screen is ( ) 3 3 1 -9 0.75 10 m 0.85 10 m 1.1 m 587.5 10 m a L y λ ×
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