Question 1

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 2

You run directly towards a plane mirror at 5 m/s. How fast do you approach your image?

Accepted Answer

A) 0 m/s 
B) 5 m/s 
C) 7 m/s 
D) 10 m/s 
E) 2 m/s 
A) 0 m/s 
B) 5 m/s 
C) 7 m/s 
D) 10 m/s 
E) 2 m/s

Question 3

How far are you from your image when you stand 0.75 m in front of a vertical plane mirror?

Accepted Answer

A) 0.38 m 
B) 0.75 m 
C) 1.5 m 
D) 3.0 m 
E) none of the given answers 
A) 0.38 m 
B) 0.75 m 
C) 1.5 m 
D) 3.0 m 
E) none of the given answers

Question 4

Light enters air from water. The angle of refraction will be

Accepted Answer

A) greater than the angle of incidence. 
B) equal to the angle of incidence. 
C) less than the angle of incidence. 
D) greater than or equal to the angle of incidence. 
E) less than or equal to the angle of incidence. 
A) greater than the angle of incidence. 
B) equal to the angle of incidence. 
C) less than the angle of incidence. 
D) greater than or equal to the angle of incidence. 
E) less than or equal to the angle of incidence.

Question 5

A ray of light consisting of blue light (wavelength 480 nm) and red light (wavelength 670 nm) is incident on a thick piece of glass at 80°. What is the angular separation between the refracted red and refracted blue beams while they are in the glass? (The respective indices of refraction for the blue light and the red light are 1.4636 and 1.4561.)

Accepted Answer

A) 0.27° 
B) 0.33° 
C) 0.34° 
D) 0.46° 
E) 0.54° 
A) 0.27° 
B) 0.33° 
C) 0.34° 
D) 0.46° 
E) 0.54°

Question 6

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 7

Concave spherical mirrors produce images which

Accepted Answer

A) are always smaller than the actual object. 
B) are always larger than the actual object. 
C) are always the same size as the actual object. 
D) could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object. 
A) are always smaller than the actual object. 
B) are always larger than the actual object. 
C) are always the same size as the actual object. 
D) could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

Question 8

A lighted candle is 10 m away from a wall. A concave mirror is being used to project an image of the candle onto the wall. If the image is going to be 3.0 times the size of the object, how far should the mirror be from the wall?

Accepted Answer

A) 6.5 m 
B) 7.0 m 
C) 6.0 m 
D) 5.5 m 
E) 15 m 
A) 6.5 m 
B) 7.0 m 
C) 6.0 m 
D) 5.5 m 
E) 15 m

Question 9

A laser beam strikes a plane's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?

Accepted Answer

A) 43° 
B) 86° 
C) 45° 
D) 90° 
E) 0° 
A) 43° 
B) 86° 
C) 45° 
D) 90° 
E) 0°

Question 10

If n1 is the index of refraction for the incident medium and n2 is the index for the refracting medium, the critical angle will exist

Accepted Answer

A) in all cases, it will just have different values. 
B) when n1 2. 
C) when n1 = n2. 
D) never. 
E) when n1 > n2. 
A) in all cases, it will just have different values. 
B) when n1 2. 
C) when n1 = n2. 
D) never. 
E) when n1 > n2.

Question 11

John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?

Accepted Answer

A) 10 cm 
B) 20 cm 
C) 30 cm 
D) 40 cm 
E) 50 cm 
A) 10 cm 
B) 20 cm 
C) 30 cm 
D) 40 cm 
E) 50 cm

Question 12

A beam of white light is incident on a thick glass plate with parallel sides, at an angle between 0° and 90° with the normal. Which color emerges from the other side first?

Accepted Answer

A) red 
B) green 
C) blue. 
D) violet 
E) None of the given; all colors emerge at the same time. 
A) red 
B) green 
C) blue. 
D) violet 
E) None of the given; all colors emerge at the same time.

Question 13

An image formed when the light rays pass through the image location, and could appear on paper or film placed at that location is referred to as a(n)

Accepted Answer

A) real image. 
B) virtual image. 
C) imaginary image. 
D) positive image. 
E) negative image. 
A) real image. 
B) virtual image. 
C) imaginary image. 
D) positive image. 
E) negative image.

Question 14

If the absolute value of the magnification is equal to one, then the image is

Accepted Answer

A) larger than the object. 
B) the same size as the object. 
C) smaller than the object. 
A) larger than the object. 
B) the same size as the object. 
C) smaller than the object.

Question 15

The image formed by a concave mirror when the object is placed between the mirror and the focal point has the following characteristics:

Accepted Answer

A) virtual, upright, enlarged, image distance is larger than object distance 
B) virtual, upright, reduced, image distance is smaller than object distance 
C) real, inverted, enlarged, image distance is larger than object distance 
D) real, upright, enlarged, image distance is larger than object distance 
E) virtual, inverted, reduced, image distance is smaller than object distance 
A) virtual, upright, enlarged, image distance is larger than object distance 
B) virtual, upright, reduced, image distance is smaller than object distance 
C) real, inverted, enlarged, image distance is larger than object distance 
D) real, upright, enlarged, image distance is larger than object distance 
E) virtual, inverted, reduced, image distance is smaller than object distance

Question 16

An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification?

Accepted Answer

A) -0.50 
B) -1.0 
C) -1.5 
D) -2.0 
E) -2.5 
A) -0.50 
B) -1.0 
C) -1.5 
D) -2.0 
E) -2.5

Question 17

If the absolute value of the magnification is smaller than one, then the image is

Accepted Answer

A) larger than the object. 
B) the same size as the object. 
C) smaller than the object. 
A) larger than the object. 
B) the same size as the object. 
C) smaller than the object.

Question 18

The speed of light in a certain medium is 2.2 x 108 m/s. What is the index of refraction of this medium?

Accepted Answer

A) 1.0 
B) 1.2 
C) 1.4 
D) 1.6 
E) 1.8 
A) 1.0 
B) 1.2 
C) 1.4 
D) 1.6 
E) 1.8

Question 19

Which of the following sets of characteristics describes the image formed by a plane mirror?

Accepted Answer

A) real and inverted 
B) real and upright 
C) virtual and upright 
D) virtual and inverted 
E) All of the previous statements can be correct. 
A) real and inverted 
B) real and upright 
C) virtual and upright 
D) virtual and inverted 
E) All of the previous statements can be correct.

Question 20

Light enters a substance from air at 30.0° to the normal. It continues through the substance at 23.0° to the normal. What would be the critical angle for this substance?

Accepted Answer

A) 53.0° 
B) 51.4° 
C) 36.7° 
D) 23.8° 
E) 12.6° 
A) 53.0° 
B) 51.4° 
C) 36.7° 
D) 23.8° 
E) 12.6°

Exam 32: Light: Reflection and Refraction

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

You run directly towards a plane mirror at 5 m/s. How fast do you approach your image?

How far are you from your image when you stand 0.75 m in front of a vertical plane mirror?

Light enters air from water. The angle of refraction will be

The image formed in a plane mirror is

Concave spherical mirrors produce images which

A lighted candle is 10 m away from a wall. A concave mirror is being used to project an image of the candle onto the wall. If the image is going to be 3.0 times the size of the object, how far should the mirror be from the wall?

A laser beam strikes a plane's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?

If n1 is the index of refraction for the incident medium and n2 is the index for the refracting medium, the critical angle will exist

John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?

A beam of white light is incident on a thick glass plate with parallel sides, at an angle between 0° and 90° with the normal. Which color emerges from the other side first?

An image formed when the light rays pass through the image location, and could appear on paper or film placed at that location is referred to as a(n)

If the absolute value of the magnification is equal to one, then the image is

The image formed by a concave mirror when the object is placed between the mirror and the focal point has the following characteristics:

An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification?

If the absolute value of the magnification is smaller than one, then the image is

The speed of light in a certain medium is 2.2 x 108 m/s. What is the index of refraction of this medium?

Which of the following sets of characteristics describes the image formed by a plane mirror?

Light enters a substance from air at 30.0° to the normal. It continues through the substance at 23.0° to the normal. What would be the critical angle for this substance?

Introduction, Measurement, Estimating

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Filters

If n₁ is the index of refraction for the incident medium and n₂ is the index for the refracting medium, the critical angle will exist

The speed of light in a certain medium is 2.2 x 10⁸ m/s. What is the index of refraction of this medium?