p37_041

# p37_041 - B . We note that angle 6 APB is the same as , and...

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41. Consider two of the rays shown in Fig. 37-37, one just above the other. The extra distance traveled by the lower one may be found by drawing perpendiculars from where the top ray changes direction (point P ) to the incident and di±racted paths of the lower one. Where these perpendiculars intersect the lower ray’s paths are here referred to as points A and C . Where the bottom ray changes direction is point
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Unformatted text preview: B . We note that angle 6 APB is the same as , and angle BPC is the same as (see Fig. 37-37). The dierence in path lengths between the two adjacent light rays is x = | AB | + | BC | = d sin + d sin . The condition for bright fringes to occur is therefore x = d (sin + sin ) = m where m = 0 , 1 , 2 , . If we set = 0 then this reduces to Eq. 37-22....
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