AP Physics 2: Algebra-Based Practice Quiz: Reflection

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 14 questions to check your progress.

Question 1 of 14

According to the provided text, how is a light ray best described?

A)A curved path showing light's energyB)A straight line perpendicular to the wavefrontC)The entire wavefront of a light waveD)A line parallel to the reflecting surface

All Questions (14)

According to the provided text, how is a light ray best described?

A) A curved path showing light's energy

B) A straight line perpendicular to the wavefront

C) The entire wavefront of a light wave

D) A line parallel to the reflecting surface

Correct Answer: B

The content explicitly states, 'A light ray is a straight line that is perpendicular to the wavefront of a light wave and points in the direction of travel of the wave.'

The law of reflection establishes a direct equality between which two quantities?

A) The incident ray and the reflected ray

B) The incident ray and the surface

C) The angle of incidence and the angle of reflection

D) The reflected ray and the normal

Correct Answer: C

The law of reflection states that the angle between the incident ray and the normal (the angle of incidence) is equal to the angle between the reflected ray and the normal (the angle of reflection).

A light ray strikes a smooth, flat surface with an angle of incidence of 40°. What will be the angle of reflection?

A) 20°

B) 40°

C) 50°

D) 80°

Correct Answer: B

According to the law of reflection, the angle of reflection is equal to the angle of incidence (θr = θi). Therefore, if θi = 40°, then θr = 40°.

In the context of light reflection, the 'normal' is defined as:

A) A line parallel to the direction of the incident ray

B) The reflecting surface itself

C) A line perpendicular to the reflecting surface at the point of incidence

D) The standard angle of reflection for a given material

Correct Answer: C

The provided text defines the normal as 'the line perpendicular to the surface.' The angles of incidence and reflection are measured relative to this line.

A ray of light strikes a mirror. The angle between the incident ray and the mirror's surface is 30°. What is the angle of reflection?

A) 30°

B) 45°

C) 60°

D) 90°

Correct Answer: C

The angle of incidence is measured between the incident ray and the normal, not the surface. The normal is perpendicular (90°) to the surface. Therefore, the angle of incidence is 90° - 30° = 60°. By the law of reflection, the angle of reflection is equal to the angle of incidence, so it is also 60°.

Which of the following best describes specular reflection?

A) Reflection of light in many different directions from a rough surface

B) The absorption of light by a black surface

C) The bending of light as it enters a new medium

D) Uniform reflection of light from a smooth surface

Correct Answer: D

The content defines specular reflection as 'the reflection of light from a smooth surface and results in light uniformly reflected from the surface.'

Which equation correctly represents the law of reflection?

A) θr + θi = 90°

B) θr = 2 * θi

C) θr > θi

D) θr = θi

Correct Answer: D

The provided content explicitly gives the relevant equation for the law of reflection as θr = θi, stating that the angle of reflection equals the angle of incidence.

During an experiment involving specular reflection, the angle between the reflected ray and the normal is measured to be 55°. What was the angle between the incident ray and the surface?

A) 35°

B) 45°

C) 55°

D) 110°

Correct Answer: A

According to the law of reflection, θi = θr. If the angle of reflection (θr) is 55°, then the angle of incidence (θi) is also 55°. The angle of incidence is measured from the normal, which is 90° to the surface. Therefore, the angle between the incident ray and the surface is 90° - θi = 90° - 55° = 35°.

What is the geometric relationship between a light ray and its corresponding wavefront?

A) They are parallel to each other.

B) They are perpendicular to each other.

C) They are the same entity.

D) There is no fixed relationship.

Correct Answer: B

The provided text states that 'A light ray is a straight line that is perpendicular to the wavefront of a light wave.'

If a light ray strikes a mirror along the normal, what is the angle of reflection?

A) 0°

B) 45°

C) 90°

D) 180°

Correct Answer: A

If the incident ray travels along the normal, the angle between the incident ray and the normal is 0°. Therefore, the angle of incidence (θi) is 0°. By the law of reflection (θr = θi), the angle of reflection (θr) must also be 0°. This means the light reflects directly back along the path it came.

Specular reflection, which follows the law of reflection, occurs on what type of surface?

A) A rough surface

B) A dark-colored surface

C) A smooth surface

D) Any liquid surface

Correct Answer: C

The content explicitly states that 'Specular reflection is the reflection of light from a smooth surface.'

A light ray is incident on a plane mirror at an angle of 32° with respect to the normal. What is the total angle between the incident ray and the reflected ray?

A) 32°

B) 58°

C) 64°

D) 116°

Correct Answer: C

The angle of incidence (θi) is 32°. According to the law of reflection, the angle of reflection (θr) is also 32°. The total angle between the two rays is the sum of the angle of incidence and the angle of reflection: θi + θr = 32° + 32° = 64°.

In the ray model of light, what information does the ray provide besides its path?

A) The intensity of the light wave

B) The frequency of the light wave

C) The direction of travel of the wave

D) The phase of the light wave

Correct Answer: C

The content specifies that a light ray is a straight line that 'points in the direction of travel of the wave.'

An observer notes that a light ray strikes a surface such that the angle between the incident ray and the surface is 15°. For this to be a valid specular reflection, what must be the angle between the reflected ray and the surface?

A) 15°

B) 75°

C) 90°

D) 165°

Correct Answer: A

First, find the angle of incidence (θi). It is the angle between the ray and the normal (90° to the surface): θi = 90° - 15° = 75°. By the law of reflection, the angle of reflection (θr) must also be 75°. The question asks for the angle between the reflected ray and the surface, which is 90° - θr = 90° - 75° = 15°.