6.3.1 Reflection of Waves

• The angle of reflection is equal to the angle of incidence.

  True
• Match the terms with their definitions:

  Angle of Incidence ↔️ Angle between incident ray and normal

  Angle of Reflection ↔️ Angle between reflected ray and normal
• The incident ray, reflected ray, and the normal all lie in the same plane
• The angle between the incident ray and the normal is called the angle of incidence
• The law of reflection states that the angle of incidence equals the angle of reflection

  True
• The incident ray, reflected ray, and normal all lie in the same plane
• Reflection is the process where a wave bounces back from a surface
• The law of reflection states that the incident ray, reflected ray, and normal all lie in the same plane
• The law of reflection can be represented mathematically as $\theta_{i} =$$\theta_{r}$.


  True
• Steps to describe the law of reflection

  1️⃣ State that the angle of incidence equals the angle of reflection

  2️⃣ Define the angle of incidence

  3️⃣ Define the angle of reflection

  4️⃣ Explain that the incident ray, reflected ray, and normal lie in the same plane
• If light hits a mirror at an angle of 30 degrees, what is the angle of reflection?

  30 degrees
• The law of reflection states that the angle of incidence equals the angle of reflection
• The incident ray, reflected ray, and normal must all lie in the same plane according to the law of reflection

  True
• The frequency of a reflected wave is the same as the frequency of the incident wave

  True
• Match the property with the correct type of wave:

  Direction ↔️ Towards the surface for incident wave, away for reflected wave

  Angle ↔️ Angle of incidence or reflection

  Frequency ↔️ Same for incident and reflected waves
• Diffuse reflection occurs when waves reflect off a rough or uneven surface


  True
• Match the type of reflection with its property:

  Regular Reflection ↔️ Angle of reflection equals angle of incidence

  Diffuse Reflection ↔️ Waves scatter in multiple directions

  Surface ↔️ Smooth and flat for regular, rough and uneven for diffuse
• In sound reflection, echoes in caves are examples of sound waves reflecting off a rough surface
• What is an example of sound reflection used in navigation systems?

  Sonar
• Match the term with its definition:

  Angle of Incidence ↔️ The angle between the incident ray and the normal

  Angle of Reflection ↔️ The angle between the reflected ray and the normal

  Plane of Incidence ↔️ The plane containing the incident ray, reflected ray, and normal
• What mathematical notation represents the law of reflection?

  $\theta_{i} =$$\theta_{r}$
• Reflection is the process where a wave bounces back from a surface
• If light strikes a mirror at an angle of 45 degrees, what is the angle of reflection?

  45 degrees
• Regular reflection occurs when waves reflect off a smooth, flat surface
• In diffuse reflection, what happens to the angle of reflection?

  Waves scatter in multiple directions
• What are examples of surfaces that cause diffuse reflection?

  Walls and clouds
• The law of reflection applies to both light and sound waves


  True