18_Chapter 24 HomeworkCH24 Wave Optics

18_Chapter 24 HomeworkCH24 Wave Optics - 320 CHAPTER 24...

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320 CHAPTER 24 24.33 The locations of the dark fringes (minima) mark the edges of the maxima, and the widths of the maxima equals the spacing between successive minima. At the locations of the minima, ( ) sin m ma θ λ = and () 9 -3 tan sin 500 10 m 1.20 m 1.20 mm 0.500 10 m mmm yL L m L a mm θθ   =≈=     × == × ( Then, ) 1.20 mm ym ∆=∆ and for successive minima, 1 m = . Therefore, the width of each maxima, other than the central maximum , in this interference pattern is ( ) width 1 1.20 mm 1.20 mm y =∆ = = 24.34 At the positions of the minima, ( ) sin m = and ( ) tan sin L m m La = =≈ Thus, ( ) ( ) 31 2 yy λλ −=− = and ( )( ) 9 3 2 0.500 m 680 10 m 2 3.00
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This document was uploaded on 10/20/2011.

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