244
CHAPTER 22
22.18
At the first surface, the angle of incidence is
1
30.0
θ
=
°
, and Snell’s law gives
()
11
1
2
1.00 sin30.0
sin
sin
sin
19.5
1.50
air
glass
n
n
−−
°
==
=
1
°
Since the second surface is parallel to the first, the angle of incidence at the second
surface is
=
19.5
°
and the angle of refraction is
( )
2
sin
1.50 sin19.5
sin
30.0
1.00
ss
glass
air
n
°
sin
gla
n
=
°
Thus, the light emerges traveling parallel to the incident beam.
22.19
The angle of refraction at the first surface is
2
19.5
=
°
(see
Problem 18). Let
h
represent the distance from point
a
to
c
(that is, the hypotenuse of triangle
abc
). Then,
2
2.00 cm
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 Spring '09
 Physics, Work, Light, Reflection And Refraction, Angle of Incidence, Snell's Law, Sin, Total internal reflection, nair

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