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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.
 Spring '09
 Physics, Work

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