
Concept explainers
(a)
The angle of refraction θs in the sapphire crystal.
(a)

Answer to Problem 96PQ
The angle of refraction θs, in the sapphire crystal is 15.0°.
Explanation of Solution
Write the expression for Snell’s law that relates the angle of incidence and angle of refraction of a light ray when it travels from one medium to the other medium.
nasinθa=nssinθs (I)
Here, na is the refractive index of the air medium, ns is the refractive index of the sapphire crystal medium, θa is the angle of incidence of air and θs is the angle of refraction of sapphire crystal.
Solve the above equation to find θs.
nasinθa=nssinθssinθs=sinθa(nans)θs=sin−1(sinθa(nans)) (II)
Conclusion:
Substitute 1.760 for ns, 27.0° for θa, 1.00 for na in equation (II).
Here, ns=1.495 and θa=27.0° are taken from given data and na=1.00 for the air medium.
θs=sin−1(sinθa(nans))=sin−1(sin27.0°(1.001.760))=sin−1(0.45390(0.56818))=15.0°
Therefore, the angle of refraction θs, in the sapphire crystal is 15.0°.
(b)
The angle of incidence of the light ray at the sapphire air interface.
(b)

Answer to Problem 96PQ
The angle of incidence of the light ray at the sapphire air interface is 15.0°.
Explanation of Solution
Consider the diagram.
Figure-(1)
The above figure defines the light ray incident on the rectangular sapphire crystal at an angle of incidence is θa=27.0° and the angle of refraction of the light ray inside the crystal is θs.
Inside the sapphire crystal the ray travels in a straight line because the medium is same. So the angle of refraction at the air sapphire interface θs is equal to the angle of incidence at the sapphire interface θa.
θs=θa
Therefore, the angle of incidence of the light ray at the sapphire air interface is 15.0°.
(c)
The angle of refraction of the light ray at crystal air interface.
(c)

Answer to Problem 96PQ
The angle of refraction of the light ray at crystal air interface is 27.0°.
Explanation of Solution
Write the expression for Snell’s law that relates the angle of incidence and angle of refraction of a light ray when it travels from one medium to the other medium.
na,1sinθa,1=ns,1sinθs,1 (III)
Here, na is the refractive index of the air medium, ns is the refractive index of the sapphire crystal medium, θa is the angle of incidence of air and θs is the angle of refraction of sapphire crystal.
Solve the above equation to find sinθs,1.
na,1sinθa,1=ns,1sinθs,1sinθs,1=sinθa,1(na,1ns,1)θs,1=sin−1(sinθa,1(na,1ns,1)) (IV)
Conclusion:
Substitute 1.00 for ns,1, 14.94° for θa,1,1.760 for na,1 in equation (IV).
θs,1=sin−1(sinθa,1(na,1ns,1))=sin−1(sin14.94°(1.7601.00))=sin−1((0.2578)(1.760))=27.0°
Therefore, the angle of refraction of the light ray at the crystal air interface is 27.0°.
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Chapter 38 Solutions
Physics for Scientists and Engineers: Foundations and Connections
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