Physics 2B 12/6/2020
Name______________
Conceptual Questions: Geometric Optics
Circle the best answer or write the appropriate response
1. Which diagram best represents the path taken by a ray of monochromatic light as it passes from air
through the materials shown?
2. The diagram below shows a ray of light passing from air into
glass at an angle of incidence of 0°.
A. Only the speed changes.
B. Only the direction changes.
C. Both the speed and the direction change.
D. Neither the speed nor direction change.
3. A diverging lens of focal length f is placed is placed in water. The magnitude of the focal length of the lens
in water is ____________ the focal length in air.
A. less than
B. greater than
C. same as
D. infinite compared to
4. When light of one wavelength from air hits a smooth piece of glass at an angle, which of the following will
not occur?
a. reflection b. refraction c. dispersion d. All of the above will occur.
5. When an astronomer uses a telescope to view events on a star that is 1000 light years away, this means
that
A. the astronomer is viewing events that are 1000 years into the future.
B. the astronomer is viewing events that are 2000 years into the future.
C. the astronomer is viewing events that are 1000 years into the past.
D. the astronomer is viewing events that are 2000 years into the past.
6. A handful of white sand-like material is poured into a beaker of clear oil and vanishes from sight as it
passes into the liquid. We can conclude that
A. the material dissolved.
B. This phenomenon is impossible and could not have happened.
C. The oil and material have mutually decomposed.
D. The oil has the same index of refraction as the material.
E. None of the above.
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