Question 1

A concave spherical mirror has a focal length of 12 cm. If an object is placed 6 cm in front of it the image position is:

Accepted Answer

A)  4 cm behind the mirror 
B)  4 cm in front of the mirror 
C)  12 cm behind the mirror 
D)  12 cm in front of the mirror 
E)  at infinity 
A)  4 cm behind the mirror 
B)  4 cm in front of the mirror 
C)  12 cm behind the mirror 
D)  12 cm in front of the mirror 
E)  at infinity

Question 2

An erect object is in front of a convex mirror a distance greater than the focal length. The image is:

Accepted Answer

A)  real, inverted, and smaller than the object 
B)  virtual, inverted, and larger than the object 
C)  real, inverted, and larger than the object 
D)  virtual, erect, and smaller than the object 
E)  real, erect, and larger than the object 
A)  real, inverted, and smaller than the object 
B)  virtual, inverted, and larger than the object 
C)  real, inverted, and larger than the object 
D)  virtual, erect, and smaller than the object 
E)  real, erect, and larger than the object

Question 3

Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope. In ordinary use, the object:

Accepted Answer

A)  is less than fo from the objective lens 
B)  is more that fo from the objective 
C)  produces an intermediate image which is slightly more than fe from the eyepiece 
D)  produces an intermediate image which is 2fe away from the eyepiece 
E)  produces an intermediate image which is less than fo from the objective 
A)  is less than fo from the objective lens 
B)  is more that fo from the objective 
C)  produces an intermediate image which is slightly more than fe from the eyepiece 
D)  produces an intermediate image which is 2fe away from the eyepiece 
E)  produces an intermediate image which is less than fo from the objective

Question 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:

Accepted Answer

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 
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

Question 5

The Sun subtends 0.5 $\degree$as seen from the Earth. Its image, using a 1.0-m focal length lens, is about:

Accepted Answer

A)  10 cm 
B)  2 cm 
C)  1 cm 
D)  5 mm 
E)  1 mm 
A)  10 cm 
B)  2 cm 
C)  1 cm 
D)  5 mm 
E)  1 mm

Question 6

The focal length of a spherical mirror is N times its radius of curvature where N is:

Accepted Answer

A)  1/4 
B)  1/2 
C)  1 
D)  2 
E)  4 
A)  1/4 
B)  1/2 
C)  1 
D)  2 
E)  4

Question 7

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis:

Accepted Answer

A)  3 cm from the surface 
B)  6 cm from the surface 
C)  12 cm from the surface 
D)  18 cm from the surface 
E)  24 cm from the surface 
A)  3 cm from the surface 
B)  6 cm from the surface 
C)  12 cm from the surface 
D)  18 cm from the surface 
E)  24 cm from the surface

Question 8

An erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The magnification is +0.4. This means:

Accepted Answer

A)  the image is real and erect and the lens is a converging lens 
B)  the image is real and inverted and the lens is a converging lens 
C)  the image is virtual and erect, and the lens is a diverging lens 
D)  the image is virtual and erect, and the lens is a converging lens 
E)  the image is virtual and inverted and the lens is a diverging lens 
A)  the image is real and erect and the lens is a converging lens 
B)  the image is real and inverted and the lens is a converging lens 
C)  the image is virtual and erect, and the lens is a diverging lens 
D)  the image is virtual and erect, and the lens is a converging lens 
E)  the image is virtual and inverted and the lens is a diverging lens

Question 9

The term "virtual" as applied to an image made by a mirror means that the image:

Accepted Answer

A)  is on the mirror surface 
B)  cannot be photographed by a camera 
C)  is in front of the mirror 
D)  is the same size as the object 
E)  cannot be shown directly on a screen 
A)  is on the mirror surface 
B)  cannot be photographed by a camera 
C)  is in front of the mirror 
D)  is the same size as the object 
E)  cannot be shown directly on a screen

Question 10

An object O, in air, is in front of the concave spherical refracting surface a piece of glass. Which of the general situations depicted below is like this situation?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 11

A card marked IAHIO8 is standing upright in front of a plane mirror. Which of the following is NOT true?

Accepted Answer

A)  The image is virtual 
B)  The image shifts its position as the observer shifts his position 
C)  The image appears as 8OIHAI to a person looking in the mirror 
D)  The image is caused mostly by specular rather than diffuse reflection 
E)  The image is the same size as the object 
A)  The image is virtual 
B)  The image shifts its position as the observer shifts his position 
C)  The image appears as 8OIHAI to a person looking in the mirror 
D)  The image is caused mostly by specular rather than diffuse reflection 
E)  The image is the same size as the object

Question 12

A concave spherical mirror has a focal length of 12 cm. If an object is placed 18 cm in front of it the image position is:

Accepted Answer

A)  7.2 cm behind the mirror 
B)  7.2 cm in front of the mirror 
C)  36 cm behind the mirror 
D)  36 cm in front of the mirror 
E)  at infinity 
A)  7.2 cm behind the mirror 
B)  7.2 cm in front of the mirror 
C)  36 cm behind the mirror 
D)  36 cm in front of the mirror 
E)  at infinity

Question 13

An object is 30 cm in front of a converging lens of focal length 10 cm. The image is:

Accepted Answer

A)  real and larger than the object 
B)  real and the same size than the object 
C)  real and smaller than the object 
D)  virtual and the same size than the object 
E)  virtual and smaller than the object 
A)  real and larger than the object 
B)  real and the same size than the object 
C)  real and smaller than the object 
D)  virtual and the same size than the object 
E)  virtual and smaller than the object

Question 14

A concave mirror forms a real image which is twice the size of the object. If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

Accepted Answer

A)  13 cm 
B)  20 cm 
C)  27 cm 
D)  40 cm 
E)  80 cm 
A)  13 cm 
B)  20 cm 
C)  27 cm 
D)  40 cm 
E)  80 cm

Question 15

An object is in front of a converging lens, at a distance less than the focal length from the lens. Its image is:

Accepted Answer

A)  virtual and larger than the object 
B)  real and smaller than the object 
C)  virtual and smaller than the object 
D)  real and larger than the object 
E)  virtual and the same size as the object 
A)  virtual and larger than the object 
B)  real and smaller than the object 
C)  virtual and smaller than the object 
D)  real and larger than the object 
E)  virtual and the same size as the object

Question 16

A concave spherical mirror has a focal length of 12 cm. If an erect object is placed 6 cm in front of it:

Accepted Answer

A)  the magnification is 2 and the image is erect 
B)  the magnification is 2 and the image is inverted 
C)  the magnification is 0.67 and the image is erect 
D)  the magnification is 0.67 and the image is inverted 
E)  the magnification is 0.5 and the image is erect 
A)  the magnification is 2 and the image is erect 
B)  the magnification is 2 and the image is inverted 
C)  the magnification is 0.67 and the image is erect 
D)  the magnification is 0.67 and the image is inverted 
E)  the magnification is 0.5 and the image is erect

Question 17

A convex spherical refracting surface separates a medium with index of refraction 2 from air. The image of an object outside the surface is real:

Accepted Answer

A)  always 
B)  never 
C)  only if it is close to the surface 
D)  only if it is far from the surface 
E)  only if the radius of curvature is small 
A)  always 
B)  never 
C)  only if it is close to the surface 
D)  only if it is far from the surface 
E)  only if the radius of curvature is small

Question 18

The object-lens distance for a certain converging lens is 400 mm. The image is three times the size of the object. To make the image five times the size of the object-lens distance must be changed to:

Accepted Answer

A)  360 mm 
B)  540 mm 
C)  600 mm 
D)  720 mm 
E)  960 mm 
A)  360 mm 
B)  540 mm 
C)  600 mm 
D)  720 mm 
E)  960 mm

Question 19

The image of an erect candle, formed using a convex mirror, is always:

Accepted Answer

A)  virtual, inverted, and smaller than the candle 
B)  virtual, inverted, and larger than the candle 
C)  virtual, erect, and larger than the candle 
D)  virtual, erect, and smaller than the candle 
E)  real, erect, and smaller than the candle 
A)  virtual, inverted, and smaller than the candle 
B)  virtual, inverted, and larger than the candle 
C)  virtual, erect, and larger than the candle 
D)  virtual, erect, and smaller than the candle 
E)  real, erect, and smaller than the candle

Question 20

Where must an object be placed in front of a converging lens in order to obtain a virtual image?

Accepted Answer

A)  At the focal point 
B)  At twice the focal length 
C)  Greater than the focal length 
D)  Between the focal point and the lens 
E)  Between the focal length and twice the focal length 
A)  At the focal point 
B)  At twice the focal length 
C)  Greater than the focal length 
D)  Between the focal point and the lens 
E)  Between the focal length and twice the focal length

Exam 34: Images

A concave spherical mirror has a focal length of 12 cm. If an object is placed 6 cm in front of it the image position is:

An erect object is in front of a convex mirror a distance greater than the focal length. The image is:

Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope. In ordinary use, the object:

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:

The Sun subtends 0.5 °\degree° as seen from the Earth. Its image, using a 1.0-m focal length lens, is about:

The focal length of a spherical mirror is N times its radius of curvature where N is:

A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of refraction of 2. To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis:

An erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The magnification is +0.4. This means:

The term "virtual" as applied to an image made by a mirror means that the image:

An object O, in air, is in front of the concave spherical refracting surface a piece of glass. Which of the general situations depicted below is like this situation?

A card marked IAHIO8 is standing upright in front of a plane mirror. Which of the following is NOT true?

A concave spherical mirror has a focal length of 12 cm. If an object is placed 18 cm in front of it the image position is:

An object is 30 cm in front of a converging lens of focal length 10 cm. The image is:

A concave mirror forms a real image which is twice the size of the object. If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

An object is in front of a converging lens, at a distance less than the focal length from the lens. Its image is:

A concave spherical mirror has a focal length of 12 cm. If an erect object is placed 6 cm in front of it:

A convex spherical refracting surface separates a medium with index of refraction 2 from air. The image of an object outside the surface is real:

The object-lens distance for a certain converging lens is 400 mm. The image is three times the size of the object. To make the image five times the size of the object-lens distance must be changed to:

The image of an erect candle, formed using a convex mirror, is always:

Where must an object be placed in front of a converging lens in order to obtain a virtual image?

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Let f_o and f_e be the focal lengths of the objective and eyepiece of a compound microscope. In ordinary use, the object:

The Sun subtends 0.5 $\degree$ as seen from the Earth. Its image, using a 1.0-m focal length lens, is about: