Physics 224 – Spring 2009 - Quiz #7
Name:______________________
**Circle the correct answer from the choices provided with each question. In addition, you must justify
your selection of an answer. You may show your mathematical work, provide a clear definition, or
eliminate the incorrect answers. Only partial credit will be given if a clear justification is not provided.
1)
2)
3) Consider the light rays depicted in the figure. What type of reflecting or refracting surface is
depicted?
1. converging lens
2. converging mirror
3. diverging lens
4. diverging mirror
5. plane mirror
6. Unable to determine.
4) For the convex mirror and its focal point illustrated, is the light ray indicated drawn correctly?
a) Yes
b) No
c) Not enough information given
5) A ray
a) is perpendicular to the direction of the energy flow.
b) is perpendicular to a series of wave fronts.
c) is always parallel to other rays.
d) illustrates the wave nature of light.
e) none of the above.
6) A chicken is standing 1.0 m in front of a vertical plane mirror. A woman is standing 5.0 m
from the mirror, behind and in line with the chicken. How far from her will she see the image of
the chicken?
a) 5.0 m
b) 1.0 m
c) 6.0 m
d) 4.0 m
e) none of these
7) Light in a transparent medium with index of refraction n 1 is incident upon a plane (flat)
interface with a second medium with index of refraction n2 (< n1). The incident light makes a
small angle q with the normal to the plane interface. Some of the light is reflected at the
interface and some of it is refracted.
The angle of the reflected light is ___ the angle of the incident light.
a) less than
b) more than
c) equal to
d) incomparable, without additional information
8) You are standing with a mirror at the center of a giant clock. Someone at 12 o’clock shines a
beam of light toward you, and you want to use the mirror to reflect the beam toward an
observer at 5 o’clock. What should the angle of incidence be to achieve this?
a) 30o
b) 45o
c) 75o
d) 90o
e) None of the above