Question 1

The image formed in a plane mirror is

Accepted Answer

A)  at the same distance in front of the mirror as the object is in front of the mirror. 
B)  at a shorter distance in front of the mirror than the distance that the object is in front of the mirror. 
C)  at the same distance behind the mirror as the object is in front of the mirror. 
D)  at a shorter distance behind the mirror than the distance the object is in front of the mirror. 
E)  at a larger distance behind the mirror than the distance the object is in front of the mirror. 
A)  at the same distance in front of the mirror as the object is in front of the mirror. 
B)  at a shorter distance in front of the mirror than the distance that the object is in front of the mirror. 
C)  at the same distance behind the mirror as the object is in front of the mirror. 
D)  at a shorter distance behind the mirror than the distance the object is in front of the mirror. 
E)  at a larger distance behind the mirror than the distance the object is in front of the mirror.

Question 2

A object is 12 cm in front of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?

Accepted Answer

A)  0.25 cm 
B)  15 cm 
C)  4.0 cm 
D)  2.4 cm 
E)  1.3 cm 
A)  0.25 cm 
B)  15 cm 
C)  4.0 cm 
D)  2.4 cm 
E)  1.3 cm

Question 3

An object 2.0 cm tall is placed 24. cm in front of a convex mirror whose focal length is 30. cm.
(a) Where is the image formed?
(b) How tall is it?

Accepted Answer

(a)13 cm b

Question 4

A concave mirror is also known as a diverging mirror.

Accepted Answer

A) True 
 B)False

Question 5

Which one of the following is the correct number for the magnification of a plane mirror?

Accepted Answer

A)  1.0 
B)  0.25 
C)  0.5 
D)  1.5 
E)  2.0 
A)  1.0 
B)  0.25 
C)  0.5 
D)  1.5 
E)  2.0

Question 6

A person approaches a plane mirror at a speed of 3 m/s. How fast does he approach his image?

Accepted Answer

A)  3 m/s 
B)  4 m/s 
C)  5 m/s 
D)  6 m/s 
E)  7 m/s 
A)  3 m/s 
B)  4 m/s 
C)  5 m/s 
D)  6 m/s 
E)  7 m/s

Question 7

John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe?

Accepted Answer

A)  half as large as his face 
B)  of the same size as his face 
C)  twice as large as his face 
D)  three times as large as his face 
E)  four times as large as his face 
A)  half as large as his face 
B)  of the same size as his face 
C)  twice as large as his face 
D)  three times as large as his face 
E)  four times as large as his face

Question 8

If the magnification of a mirror is negative, which of the following is correct?

Accepted Answer

A)  The image is upright and the mirror is convex. 
B)  The image is inverted and the mirror is convex. 
C)  The image is inverted and the mirror is concave. 
D)  All of the previous answers can be correct. 
E)  None of the previous answers is correct. 
A)  The image is upright and the mirror is convex. 
B)  The image is inverted and the mirror is convex. 
C)  The image is inverted and the mirror is concave. 
D)  All of the previous answers can be correct. 
E)  None of the previous answers is correct.

Question 9

A ray of light in air enters a glass surface at right angles to the surface. What is the angle of refraction?

Accepted Answer

A)  90° 
B)  180° 
C)  270° 
D)  360° 
E)  0° 
A)  90° 
B)  180° 
C)  270° 
D)  360° 
E)  0°

Question 10

A convex mirror always produces a virtual image smaller than the object.

Accepted Answer

A) True 
 B)False

Question 11

An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall,
(a) where is the image formed?
(b) how tall is it?

Accepted Answer

(a)60.cm b

Question 12

At what angle must a fish underwater look in order to see a fisherman at the shore? (Note:
N for water is 1.33.)

Accepted Answer

A)  41.2° 
B)  48.8° 
C)  60.0° 
D)  36.9° 
E)  90.0° 
A)  41.2° 
B)  48.8° 
C)  60.0° 
D)  36.9° 
E)  90.0°

Exam 26: Geometrical Optics

The image formed in a plane mirror is

A object is 12 cm in front of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?

An object 2.0 cm tall is placed 24. cm in front of a convex mirror whose focal length is 30. cm. (a) Where is the image formed? (b) How tall is it?

A concave mirror is also known as a diverging mirror.

Which one of the following is the correct number for the magnification of a plane mirror?

A person approaches a plane mirror at a speed of 3 m/s. How fast does he approach his image?

John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe?

If the magnification of a mirror is negative, which of the following is correct?

A ray of light in air enters a glass surface at right angles to the surface. What is the angle of refraction?

A convex mirror always produces a virtual image smaller than the object.

An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall, (a) where is the image formed? (b) how tall is it?

At what angle must a fish underwater look in order to see a fisherman at the shore? (Note: N for water is 1.33.)

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