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76. (a) With
λ
=0
.
5
µ
m, Eq. 3614 leads to
θ
= sin
−
1
(3)(0
.
5
µ
m)
2
.
00
µ
m
=48
.
6
◦
.
(b) Decreasing the frequency means increasing the wavelength – which implies
y
increases. Qualita
tively, this is easily seen with Eq. 3617. One should exercise caution in appealing to Eq. 3617 here,
due to the fact the small angle approximation is not justiFed in this problem. The new wavelength
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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.
 Fall '08
 SPRUNGER
 Physics

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