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35.16:
(a) Dark fringe implies destructive interference.
λ
2
1
sin
=
θ
d
m
10
64
.
1
0
.
11
sin
2
m
10
624
sin
2
λ
6
9


×
=
°
×
=
=
d
(b) Bright fringes:
λ
sin
max
max
m
θ
d
=
The largest that
θ
can be is
m
d
m
Since
6
.
2
λ
/
so
,
90
m
10
624
m
10
1.64
max
9
6
=
=
=
°


×
×
is an integer, its
maximum value is 2. There are 5 bright fringes, the central spot and 2 on each side of it.
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This note was uploaded on 01/31/2009 for the course PHYS 221 taught by Professor Hu during the Spring '08 term at Texas A&M.
 Spring '08
 HU

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