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Reflection and Refraction of Light
241
22.9
(a) From Snell’s law,
( )
11
2
2
1.00 sin30.0
sin
1.52
sin
sin19.24
n
n
θ
°
==
=
°
(b)
0
2
2
632.8 nm
417 nm
1.52
n
λ
=
(c)
8
14
9
0
3.00
10 m s
4.74
10
Hz
632.8
10
m
c
−
×
=
×
×
f
in air and in syrup
(d)
8
8
2
2
3.00
1.98
1.52
c
n
×
=
×
v
22.10
(a) When light refracts from air
( )
1
1.00
n
=
into the
Crown glass, Snell’s law gives the angle of
refraction as
1
2
sin
sin25.0
−
=°
2
Crown
glass
n
For first quadrant angles, the sine of the angle
increases as the angle increases. Thus, from the
above equation, note that
will increase when
the index of refraction of the Crown glass
decreases. From Figure 22.14, this means that
the longer wavelengths have the largest angles
of refraction, and
deviate the least from the

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