Question 1

A ray of light, which is traveling in air, is incident on a glass plate at a 45° angle. The angle of refraction in the glass

Accepted Answer

A) is less than 45°. 
B) is greater than 45°. 
C) is equal to 45°. 
D) could be any of the above; it all depends on the index of refraction of glass. 
A) is less than 45°. 
B) is greater than 45°. 
C) is equal to 45°. 
D) could be any of the above; it all depends on the index of refraction of glass.

Question 2

An object is placed 6.0 cm in front of a convex mirror with a radius of curvature of 16.0 cm. Which of the following statements describes the image?

Accepted Answer

A) The image is upright and 3.4 cm in front of the mirror. 
B) The image is inverted and 3.4 cm behind the mirror. 
C) The image is upright and 3.4 cm behind the mirror. 
D) The image is inverted and 3.4 cm in front of the mirror. 
E) none of the above 
A) The image is upright and 3.4 cm in front of the mirror. 
B) The image is inverted and 3.4 cm behind the mirror. 
C) The image is upright and 3.4 cm behind the mirror. 
D) The image is inverted and 3.4 cm in front of the mirror. 
E) none of the above

Question 3

The reflection of light from a rough surface is called specular reflection.

Accepted Answer

A) True 
 B)False

Question 4

A light ray in air is incident on an air to glass interface at an angle of 45° and is refracted at an angle of 30° to the normal. What is the index of refraction of the glass?

Accepted Answer

A) 1.23 
B) 1.31 
C) 1.41 
D) 1.52 
E) 1.74 
A) 1.23 
B) 1.31 
C) 1.41 
D) 1.52 
E) 1.74

Question 5

A mirror with a focal length 100 cm has a 4.0 cm object placed 20 cm in front of it. What is the position of the image?

Accepted Answer

A) 25 cm behind the mirror 
B) 100 cm in front of the mirror 
C) 20 cm in front of the mirror 
D) 20 cm behind the mirror 
E) 25 cm in front of the mirror 
A) 25 cm behind the mirror 
B) 100 cm in front of the mirror 
C) 20 cm in front of the mirror 
D) 20 cm behind the mirror 
E) 25 cm in front of the mirror

Question 6

If the image distance is positive, the image formed by a mirror is 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 7

The index of refraction of diamond is 2.42. This means that a given frequency of light travels

Accepted Answer

A) 2.42 times faster in air than it does in diamond. 
B) 2.42 times faster in diamond than it does in air. 
C) 2.42 times faster in vacuum than it does in diamond. 
D) 2.42 times faster in diamond than it does in vacuum. 
E) 2.42 times faster in vacuum than it does in air. 
A) 2.42 times faster in air than it does in diamond. 
B) 2.42 times faster in diamond than it does in air. 
C) 2.42 times faster in vacuum than it does in diamond. 
D) 2.42 times faster in diamond than it does in vacuum. 
E) 2.42 times faster in vacuum than it does in air.

Question 8

The angle of incidence

Accepted Answer

A) must equal the angle of reflection. 
B) is always less than the angle of reflection. 
C) is always greater than the angle of reflection. 
D) may be less than or equal to the angle of reflection. 
E) may be greater than or equal to the angle of reflection. 
A) must equal the angle of reflection. 
B) is always less than the angle of reflection. 
C) is always greater than the angle of reflection. 
D) may be less than or equal to the angle of reflection. 
E) may be greater than or equal to the angle of reflection.

Question 9

A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?

Accepted Answer

A) 20 cm behind the mirror 
B) 25 cm behind the mirror 
C) 100 cm in front of the mirror 
D) 25 cm in front of the mirror 
E) 20 cm in front of the mirror 
A) 20 cm behind the mirror 
B) 25 cm behind the mirror 
C) 100 cm in front of the mirror 
D) 25 cm in front of the mirror 
E) 20 cm in front of the mirror

Question 10

As viewed from underwater, at what angle from the vertical does the Sun appear to set?

Accepted Answer

A) 0° 
B) 90° 
C) 49° 
D) 41° 
E) 45° 
A) 0° 
B) 90° 
C) 49° 
D) 41° 
E) 45°

Question 11

Plane 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 or the same size as the actual object, depending on the placement of the object. 
E) could be larger 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 or the same size as the actual object, depending on the placement of the object. 
E) could be larger or the same size as the actual object, depending on the placement of the object.

Question 12

For total internal reflection to take place, light must go from a medium of lower index of refraction to a medium of higher index of refraction.

Accepted Answer

A) True 
 B)False

Question 13

An image is 4.0 cm behind a concave mirror with focal length 5.0 cm. Where is the object?

Accepted Answer

A) 2.2 cm in front of the mirror 
B) 2.2 cm behind the mirror 
C) 9.0 cm in front of the mirror 
D) 1.0 cm behind the mirror 
E) 20 cm behind the mirror 
A) 2.2 cm in front of the mirror 
B) 2.2 cm behind the mirror 
C) 9.0 cm in front of the mirror 
D) 1.0 cm behind the mirror 
E) 20 cm behind the mirror

Question 14

For all transparent material substances, the index of refraction

Accepted Answer

A) is less than 1. 
B) is greater than 1. 
C) is equal to 1. 
D) is less than or equal to 1. 
E) is greater than or equal to 1. 
A) is less than 1. 
B) is greater than 1. 
C) is equal to 1. 
D) is less than or equal to 1. 
E) is greater than or equal to 1.

Question 15

An optic fiber is made of clear plastic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guide"?

Accepted Answer

A) >21.1° 
B) >23.4° 
C) >38.3° 
D) >40.3° 
E) >41.8° 
A) >21.1° 
B) >23.4° 
C) >38.3° 
D) >40.3° 
E) >41.8°

Question 16

A single concave spherical mirror produces an image which is

Accepted Answer

A) always virtual. 
B) always imaginary. 
C) always real. 
D) real only if the object distance is less than f. 
E) real only if the object distance is greater than f. 
A) always virtual. 
B) always imaginary. 
C) always real. 
D) real only if the object distance is less than f. 
E) real only if the object distance is greater than f.

Question 17

If a material has an index of refraction of 1.461, what is the speed of light through it?

Accepted Answer

A) 2.05 × 108 m/s 
B) 2.34 × 108 m/s 
C) 1.46 × 108 m/s 
D) 4.38 × 108 m/s 
E) 5.34 × 108 m/s 
A) 2.05 × 108 m/s 
B) 2.34 × 108 m/s 
C) 1.46 × 108 m/s 
D) 4.38 × 108 m/s 
E) 5.34 × 108 m/s

Question 18

The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?

Accepted Answer

A) 5 cm 
B) 2 cm 
C) 4 cm 
D) 3 cm 
E) 1 cm 
A) 5 cm 
B) 2 cm 
C) 4 cm 
D) 3 cm 
E) 1 cm

Exam 32: Light: Reflection and Refraction

A ray of light, which is traveling in air, is incident on a glass plate at a 45° angle. The angle of refraction in the glass

An object is placed 6.0 cm in front of a convex mirror with a radius of curvature of 16.0 cm. Which of the following statements describes the image?

The reflection of light from a rough surface is called specular reflection.

A light ray in air is incident on an air to glass interface at an angle of 45° and is refracted at an angle of 30° to the normal. What is the index of refraction of the glass?

A mirror with a focal length 100 cm has a 4.0 cm object placed 20 cm in front of it. What is the position of the image?

If the image distance is positive, the image formed by a mirror is a(n)

The index of refraction of diamond is 2.42. This means that a given frequency of light travels

The angle of incidence

A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?

As viewed from underwater, at what angle from the vertical does the Sun appear to set?

Plane mirrors produce images which

For total internal reflection to take place, light must go from a medium of lower index of refraction to a medium of higher index of refraction.

An image is 4.0 cm behind a concave mirror with focal length 5.0 cm. Where is the object?

For all transparent material substances, the index of refraction

An optic fiber is made of clear plastic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guide"?

A single concave spherical mirror produces an image which is

If a material has an index of refraction of 1.461, what is the speed of light through it?

The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?

Introduction, Measurement, Estimating

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Maxwells Equations and Electromagnetic Waves

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Special Theory of Relativity

Early Quantum Theory and Models of the Atom

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