9_Ch 22 College Physics ProblemCH22 Reflection and Refraction of Light

Reflection and Refraction of Light
241
22.9 (a) From Snell’s law,
( )
1 1
2
2
1.00 sin30.0 sin
1.52
sin sin19.24
n
n
θ
θ
°
= = =
°
(b) 0
2
2
632.8 nm
417 nm
1.52 n
λ
λ = = =
(c)
8
14
9
0
3.00 10 m s
4.74 10 Hz
632.8 10 m
c
λ −
×
= ×
×
f = = in air and in syrup
(d)
8
8
2
2
3.00 10 m s
1.98 10 m s
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 θ − = °
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 θ will increase when
the index of refraction of the Crown glass
decreases. From Figure 22.14, this means that