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Phys214 Fall 2004
Midterm
Form A
6/15
1.
A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make an
angle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarized
light is:
A.
1:4
B.
1:3
C.
1:2
D.
3:4
E.
3:8
7/3
2.
A monochromatic light ray that has been traveling through water (
n
= 1.33) enters air. After the
ray enters the air, which of the following correctly describes the relative change in the speed,
frequency, and wavelength of the ray?
A.
its speed and wavelength both decrease; its frequency stays the same.
B.
its speed and wavelength both increase; its frequency stays the same.
C.
its speed and wavelength both decrease; its frequency increases.
D.
its speed and wavelength both increase; its frequency decreases.
E.
its speed stays the same, its wavelength increases, and its frequency decreases.
11/7
3.
A 5.0ft woman wishes to see a full length image of herself in a plane mirror. The minimum length
mirror required is:
A.
5 ft
B.
10 ft
C.
2.5 ft
D.
3.54 ft
E.
no answer: the farther away she stands the smaller the required mirror length
14/6
4.
A concave spherical surface with radius r separates a medium with index of refraction 2 from air.
As an object is moved toward the surface from far away along the central axis its image:
A.
changes from virtual to real when it is r/2 from the surface.
B.
changes from virtual to real when it is 2r from the surface.
C.
changes from real to virtual when it is r/2 from the surface.
D.
changes from real to virtual when it is 2r from the surface.
E.
remains virtual.
Page 1
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View Full DocumentPhys214 Fall 2004
Midterm
Form A
15/27
5.
A converging lens (lens 1) with a focal length of +20 cm is located 10 cm to the left of a diverging
lens (lens 2) having a focal length of 25 cm. If an object is located 30 cm to the left of the
converging lens, which of the following statements is true?
The final image formed by the diverging lens is:
A.
9. 50 cm to the left of lens 2 and real.
B.
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