Name:______________________________Class:__________________ Date:__________________
Assessment
Refraction
Teacher Notes and Answers
14 Refraction
OPTICAL PHENOMENA
1.
2.
3.
4.
5.
6.
7.
8.
9.
c
d
b
b
d
a
a
d
Answers may vary. Sample answer: When
an observer views a raindrop high in the sky,
the red light reaches the observer, but the
violet light, like the other spectral colors,
passes over the observer because it deviates
from the path of the white light more than
the red light does.
10. 47.29°
Given
ni = 1.361
nr = 1.000
Solution
Use the critical angle equation, sin c = nr/ni,
and solve for c.
n 1.000 c = sin 1 r = sin 1 =
ni 1.361 47.29°
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes
Name:______________________________Class:__________________ Date:__________________
Assessment
Refraction
Section Quiz: Optical Phenomena
Write the letter of the correct answer in the space provided.
_____ 1. Which of the following is necessary for light to undergo total internal
reflection?
a. The angle of incidence is less than the critical angle.
b. Light moves from a medium with a lower index of refraction into a
medium with a higher index of refraction.
c. Light moves from a medium with a higher index of refraction into
medium with a lower index of refraction.
d. The internal surface of the medium has a reflective surface like a
mirror.
_____ 2. Total internal reflection occurs only if the
a. index of refraction of the first medium is greater than one.
b. index of refraction of the second medium is greater than one.
c. index of refraction of both media are the same.
d. index of refraction of the first medium is greater than the index of
refraction of the second medium.
_____ 3. If the angle of incidence is greater than the critical angle, the ray is
_______________ at the boundary.
a. partially reflected
b. entirely reflected
c. not reflected
d. refracted
_____ 4. Even when the sun has passed just below the horizon, we can still see
the sun for a few more minutes because the sun’s light rays are
_______________ by the atmosphere.
a. reflected
b. refracted
c. inverted
d. expanded
_____ 5. A mirage is the result of
a. warmer air near the surface of Earth.
b. refraction.
c. the subconscious addition of a reflecting pool of water.
d. all of the above
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes
Name:______________________________Class:__________________ Date:__________________
Refraction continued
_____ 6. When white light passes through a prism, what color is bent most?
a. violet
b. blue
c. green
d. All colors are bent the same amount.
_____ 7. Various wavelengths of incoming light are bent at different angles
when they encounter a refracting medium. What is the name of this
phenomenon?
a. dispersion
b. image restructuring
c. internal reflection
d. Snell’s law
_____ 8. Which of the following colors of light would bend the most when
entering a refracting medium?
a. red
b. yellow
c. green
d. blue
9. What color is observed at the top of a rainbow? Explain.
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10. Find the critical angle for an ethyl alcohol-air boundary if the index of
refraction of ethyl alcohol is 1.361.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes