Physics Principles and Problems 2009

Section 18.1 : Refraction of Light

Self-Check Quizzes

1
Use the table to make a prediction about θ2 when light travels from air through quartz and water.

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A)θ2 for quartz would be larger than θ2 for water.
B)θ2 for quartz would be smaller than θ2 for water.
C)θ2 for quartz would be the same as θ2 for water.
D)Information about θ2 for quartz andwater cannot be determined from information in the table.
2
When light enters a medium where it has smaller λ, what has happened to its velocity?
A)The velocity is slower.
B)The velocity is faster.
C)It cannot be determined.
D)θ2 first needs to be determined.
3
In fiber optic cables, why can light retain its intensity?
A)because θ2 is too small for the materials used
B)because the critical angle of air is so much higher than that of the cable
C)because optical fibers have total internal reflection
D)because the cable material does not come in contact with the air
4
The mirage effect is due to _____.
A)faster light rays reaching your eyes first
B)water on the road
C)evaporating water
D)differences in air temperature
5
What allows for a phenomenon known as dispersion?
A)Dispersion can only happen in a prism or raindrops.
B)The light needs to pass through at the angle θ2.
C)The index of refraction varies for different wavelengths of light.
D)The properties of a prism due to its shape cause dispersion.
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