P36_046 - maxima A more careFul analysis such as that given in 36-7 bears this out Thus using Eq 36-35 with n 2 = 1 25 and = 700 nm yields L =

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46. The situation is analogous to that treated in Sample Problem 36-5, in the sense that the incident light is in a low index medium, the thin flm oF acetone has somewhat higher n = n 2 , and the last layer (the glass plate) has the highest reFractive index. To see very little or no reflection, according to the Sample Problem, the condition 2 L = µ m + 1 2 λ n 2 where m =0 , 1 , 2 ,... must hold. This is the same as Eq. 36-34 which was developed For the opposite situation (constructive interFerence) regarding a thin flm surrounded on both sides by air (a very di±erent context than the one in this problem). By analogy, we expect Eq. 36-35 to apply in this problem to reflection
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Unformatted text preview: maxima . A more careFul analysis such as that given in § 36-7 bears this out. Thus, using Eq. 36-35 with n 2 = 1 . 25 and λ = 700 nm yields L = 0 , 280 nm , 560 nm , 840 nm , 1120 nm , . . . For the frst several m values. And the equation shown above (equivalent to Eq. 36-34) gives, with λ = 600 nm, L = 120 nm , 360 nm , 600 nm , 840 nm , 1080 nm , . . . For the frst several m values. The lowest number these lists have in common is L = 840 nm....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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