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RESPONSE: 

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		text += "
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Name: 
 

train ch 23


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
If a virtual image is formed along the principal axis 10 cm from a concave mirror with the focal length 15 cm, what is the object distance from the mirror?
a.
30 cm
b.
10 cm
c.
12 cm
d.
6.0 cm
e.
4.4 cm
 

 2. 
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 28.0 cm from the mirror, what is its focal length?
a.
18.6 cm
b.
44.0 cm
c.
48.3 cm
d.
56.0 cm
e.
66.2 cm
 

 3. 
Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?
a.
virtual, upright and magnification greater than one
b.
real, inverted and magnification less than one
c.
virtual, upright and magnification less than one
d.
real, inverted and magnification greater than one
e.
real, upright and magnification less than one
 

 4. 
A convex mirror with a focal length of -20 cm forms an image 15 cm behind the surface. If the object height is 1.2 cm what is the image height?
a.
0.30 cm
b.
0.75 cm
c.
0.94 cm
d.
3.0 cm
e.
6.7 cm
 

 5. 
An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 8.00 cm in diameter. What is the magnification of the image?
a.
-0.200
b.
-0.500
c.
+0.143
d.
+0.250
e.
+0.500
 

 6. 
A solid glass sphere with a radius of 5.00 cm and index of refraction of 1.52 has a small coin embedded 3.00 cm from the front surface of the sphere. For the viewer looking at the coin through the glass, at what distance from the front surface of the glass does the coin's image appear to be located?
a.
2.48 cm
b.
3.20 cm
c.
5.00 cm
d.
6.85 cm
e.
7.55 cm
 

 7. 
A container is filled with fluid 1 and the apparent depth of the fluid is 5 cm. The container is next filled with fluid 2 and the apparent depth of this fluid is 4 cm. What is the ratio of the indices of refraction of these fluids?
a.
n1/n2 = 5/4
b.
n1/n2 = 4/5
c.
n1/n2 =training_test_ch_23_files/i0080000.jpg
d.
n1/n2 =training_test_ch_23_files/i0080001.jpg
e.
More information is needed to find the ratio.
 

 8. 
An object of length 3.00 cm is inside a plastic block with index of refraction 1.40. If the object is viewed through the top surface of the block at a non-zero angle from the normal, where is the object relative to its image?
a.
in the same direction as its image
b.
above the direction of its image
c.
below the direction of its image
d.
More information is needed.
 

 9. 
Two thin lenses with focal lengths 25.0 cm and 30.0 cm are placed in contact in an orientation so that their optic axes coincide. What is the focal length of the two in combination? Hint: A thin lens is one whose thickness is negligible.
a.
13.6 cm
b.
27.5 cm
c.
55.0 cm
d.
150 cm
e.
175 cm
 

 10. 
Two thin lenses with 10.0-cm focal lengths at are mounted at opposite ends of a 30.0-cm long tube. An object is located 45.0 cm from one end of the tube. How far from the opposite end is the final image?
a.
12.8 cm
b.
24.0 cm
c.
25.6 cm
d.
33.6 cm
e.
37.2 cm
 

 11. 
A projector lens is needed to form an image on a screen 10 times the size of its corresponding object. The screen is located 8.0 m from the lens. What is the required focal length of the lens?
a.
0.32 m
b.
0.54 m
c.
0.73 m
d.
1.25 m
e.
2.50 m
 

 12. 
An object, located 90 cm from a concave lens, forms an image 60 cm from the lens on the same side as the object. What is the focal length of the lens?
a.
-36 cm
b.
-75 cm
c.
-180 cm
d.
-150 cm
e.
-92 cm
 

 13. 
What is the image distance of an object 1.00 m in front of a converging lens of focal length 20.0 cm?
a.
+16.7 cm
b.
+20.0 cm
c.
+25.0 cm
d.
+33.3 cm
e.
+37.5 cm
 

 14. 
When an image is inverted compared to the object, it is also:
a.
virtual.
b.
reversed left to right.
c.
enlarged.
d.
diminished.
e.
None of the above statements is true.
 

 15. 
An object is placed 25 cm to the left of a lens of focal length 20 cm. 75 cm to the right of this lens is a plane mirror. Where does the final image form?
a.
25 cm to the right of the mirror
b.
25 cm to the left of the mirror
c.
50 cm to the left of the lens
d.
100 cm to the left of the lens
e.
150 cm to the left of the lens
 



 
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