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Q33.1
When light passes from vacuum (index of refraction n = 1)
into water (n = 1.333),
A. the wavelength increases and the frequency is unchanged.
B. the wavelength decreases and the frequency is unchanged.
C. the wavelength is unchanged and the frequency increases.
D. the wavelength is unchanged and the frequency decreases.
E. both the wavelength and the frequency change.
A33.1
When light passes from vacuum (index of refraction n = 1)
into water (n = 1.333),
A. the wavelength increases and the frequency is unchanged.
B. the wavelength decreases and the frequency is unchanged.
C. the wavelength is unchanged and the frequency increases.
D. the wavelength is unchanged and the frequency decreases.
E. both the wavelength and the frequency change.
Q33.2
Light passes from vacuum (index of refraction n = 1) into
water (n = 1.333).
If the incident angle qa is in the range 0° < qa < 90°,
A. the refracted angle is greater than the incident angle.
B. the refracted angle is equal to the incident angle.
C. the refracted angle is less than the incident angle.
D. the answer depends on the specific value of qa .
A33.2
Light passes from vacuum (index of refraction n = 1) into
water (n = 1.333).
If the incident angle qa is in the range 0° < qa < 90°,
A. the refracted angle is greater than the incident angle.
B. the refracted angle is equal to the incident angle.
C. the refracted angle is less than the incident angle.
D. the answer depends on the specific value of qa .
Q33.3
Light passes from a medium of index of refraction na into a
second medium of index of refraction nb. The angles of
incidence and refraction are qa and qb respectively.
If na < nb,
Aqa > qb and the light speeds up as it enters the second medium.
B. qa > qb and the light slows down as it enters the second medium.
C. qa < qb and the light speeds up as it enters the second medium.
D. qa < qb and the light slows down as it enters the second medium.
A33.3
Light passes from a medium of index of refraction na into a
second medium of index of refraction nb. The angles of
incidence and refraction are qa and qb respectively.
If na < nb,
Aqa > qb and the light speeds up as it enters the second medium.
B. qa > qb and the light slows down as it enters the second medium.
C. qa < qb and the light speeds up as it enters the second medium.
D. qa < qb and the light slows down as it enters the second medium.
Q33.4
Light passes from a medium of index of refraction na into a
second medium of index of refraction nb. The critical angle for
total internal reflection is qcrit.
In order for total internal reflection to occur, what must be true
about na, nb, and the incident angle qa?
A. na > nb and qa > qcrit
B. na > nb and qa < qcrit
C. na < nb and qa > qcrit
D. na < nb and qa < qcrit
A33.4
Light passes from a medium of index of refraction na into a
second medium of index of refraction nb. The critical angle for
total internal reflection is qcrit.
In order for total internal reflection to occur, what must be true
about na, nb, and the incident angle qa?
A. na > nb and qa > qcrit
B. na > nb and qa < qcrit
C. na < nb and qa > qcrit
D. na < nb and qa < qcrit
Q33.5
Three polarizing filters are stacked with the polarizing axes of
the second and third filters oriented at 45° and 90°, respectively,
relative to the polarizing axis of the first filter. Unpolarized
light of intensity I0 is incident on the first filter. The intensity of
light emerging from the third filter is
A. I 0 .
B. I 0 / 2.
C. I 0 / 2.
D. I 0 / 4.
E. I 0 / 8.
A33.5
Three polarizing filters are stacked with the polarizing axes of
the second and third filters oriented at 45° and 90°, respectively,
relative to the polarizing axis of the first filter. Unpolarized
light of intensity I0 is incident on the first filter. The intensity of
light emerging from the third filter is
A. I 0 .
B. I 0 / 2.
C. I 0 / 2.
D. I 0 / 4.
E. I 0 / 8.
Q33.6
Natural light is incident on the surface of a liquid.
The reflected light will be completely polarized if
the incident angle qa is
A. greater than the polarizing angle.
B. greater than or equal to the polarizing angle.
C. equal to the polarizing angle.
D. less than or equal to the polarizing angle.
E. less than the polarizing angle.
A33.6
Natural light is incident on the surface of a liquid.
The reflected light will be completely polarized if
the incident angle qa is
A. greater than the polarizing angle.
B. greater than or equal to the polarizing angle.
C. equal to the polarizing angle.
D. less than or equal to the polarizing angle.
E. less than the polarizing angle.