Abington Heights High School
Physics
Practice Quiz Chapter 23 - Quiz 3
1. Which one of the following statements is true concerning the focal length of a lens?
A.The focal length is the same for all colors.
B.The focal length is different for different colors because of reflection.
C.The focal length is different for different colors because of dispersion.
D.The focal length is different for different colors because of polarization.
E.The focal length is different for different colors because of spherical aberration.


2. An object is placed at the focal point of a converging lens of focal length f . What is the image distance?
A.f
B.2 f
C.1/f
D.2/f
E.at an infinite distance


3. An object is placed at the focal point of a thin diverging lens of focal length f . What is the image distance?
A.f
B.2 f
C.1/f
D.f /2
E.at an infinite distance


4. An object is placed 4.0 cm from a thin converging lens with a focal length of 12 cm. Which one of the following statements is true concerning the image?
A.The image is virtual and 6.0 cm from the lens.
B.The image is virtual and 12 cm from the lens.
C.The image is real and 3.0 cm from the lens.
D.The image is real and 6.0 cm from the lens.
E.The image is real and 12 cm from the lens.


5. A converging lens is used to focus light from a small bulb onto a book. The lens has a focal length of 10 cm and is located 40 cm from the book. Determine the distance from the lens to the light bulb.
A.8 cm
B.13 cm
C.20 cm
D.33 cm
E.50 cm


6. When an object is placed 25 cm from a lens, a real image is formed. Which one of the following conclusions is incorrect?
A.The image is upright.
B.The lens is a converging lens.
C.The image may be reduced or enlarged.
D.The image distance can be less than 25 cm.
E.The focal length of the lens is less than 25 cm.


7. When an object is placed 15 cm from a lens, a virtual image is formed. Which one of the following conclusions is incorrect?
A.The lens may be a convex or concave.
B.If the image is upright the lens must be a diverging lens.
C.If the image is reduced, the lens must be a diverging lens.
D.If the lens is a diverging lens, the image distance must be less than 15 cm.
E.If the lens is a converging lens, the focal length must be greater than 15 cm.


8. When an object is placed 20 cm from a diverging lens, a reduced image is formed. Which one of the following statements is necessarily true?
A.The image is inverted.
B.The image could be real.
C.The image distance must be greater than 20 cm.
D.The focal length of the lens may be less than 20 cm.
E.The refractive power of the lens must be greater than 0.05 diopters.


9. A 6.0-cm object is placed 30.0 cm from a lens. The resulting image height has a magnitude of 2.0 cm; and the image is inverted. What is the focal length of the lens?
A.7.5 cm
B.15.0 cm
C.22.5 cm
D.30.0 cm
E.45.0 cm


10.

A converging lens with a focal length of 12 cm produces a 3-cm high virtual image of a 1-cm high object. Which entry in the table below is correct?


image distance

location of image


A.


8 cm

same side of lens as object


B.


8 cm

opposite side of lens from object


C.


12 cm

opposite side of lens from object


D.


24 cm

opposite side of lens from object


E.


24 cm

same side of lens as object




11.

A 4-cm object is placed in front of a converging lens of focal length 20 cm. The image is formed 60 cm on the other side of the lens. Which entry in the table below is correct?


object distance

magnitude of the image height


A.


15 cm

2 cm


B.


15 cm

4 cm


C.


30 cm

4 cm


D.


30 cm

8 cm


E.


60 cm

2 cm




12. A 2.00-cm tall object is placed 40.0 cm from a lens. The resulting image is 8.00-cm tall and upright relative to the object. Determine the focal length of the lens.
A.26.6 cm
B.32.0 cm
C.53.3 cm
D.64.0 cm
E.80.0 cm


13. Joseph uses a converging lens (f = 0.12 m) to read a map located 0.080 m from the lens. What is the magnification of the lens?
A.+3.4
B.+3.0
C.+1.7
D.+0.60
E.+0.33


14.
The figure is a scaled diagram of an object and a converging lens surrounded by air. Only one focal point, F, of the lens is shown.
R-1 Ref 26-5

At which of the labeled points will the image be formed?
A.A
B.B
C.C
D.D
E.E



15.
The figure is a scaled diagram of an object and a converging lens surrounded by air. Only one focal point, F, of the lens is shown.
R-1 Ref 26-5

Which pair of terms most accurately describes the image?
A.real, upright
B.real, inverted
C.virtual, upright
D.virtual, inverted
E.virtual, reduced



16.
The figure is a scaled diagram of an object and a converging lens surrounded by air. Only one focal point, F, of the lens is shown.
R-1 Ref 26-5

The index of refraction of this lens is 1.51 for red light and 1.53 for blue light. Blue light is focused at the point F. Which one of the following statements is true concerning the focal point for red light?
A.It is also at F.
B.It is very close to D.
C.It is very close to the lens.
D.It is to the left of and close to F.
E.It is to the right of and close to F.




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