6.3.1 Reflection of Waves

• What happens to a wave during reflection?

  It bounces back
• The angle of incidence is equal to the angle of reflection.

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

  Requires a medium ↔️ Sound waves

  Can travel in a vacuum ↔️ Light waves
• The laws of reflection apply equally to light and sound waves.

  False
• What is the relationship between the angle of incidence and the angle of reflection?

  They are equal
• The angle of incidence is always equal to the angle of reflection for both light and sound waves.

  False
• In regular reflection, the reflected rays are parallel
• Regular reflection produces a clear image.


  True
• Diffuse reflection occurs when waves bounce off a rough surface.
• What type of reflection occurs off a lake surface?

  Regular reflection
• What is an example of diffuse reflection?

  Blurred reflection off a wall
• Light waves reflect off both smooth and rough surfaces, whereas sound waves reflect well off rough surfaces only.

  True
• Match the example with its description:

  Reflection in a mirror ↔️ Clear image due to smooth surface

  Reflection off a lake ↔️ Clear image following reflection laws

  Reflection off a rough wall ↔️ Blurred reflection from diffuse scattering
• What is the angle between the incident ray and the normal called?

  Angle of incidence
• Light waves can travel in a vacuum
• Regular reflection produces a clear reflection, whereas irregular reflection produces a diffuse one.
• What happens to the reflected rays in diffuse reflection?

  They scatter in directions
• What is an example of sound reflection?

  Echo
• The angle between the incident ray and the normal is called the angle of incidence
• In which plane do the incident ray, reflected ray, and normal lie?

  The same plane
• An example of sound wave reflection is an echo
• Steps in wave reflection according to the laws of reflection:

  1️⃣ Incident ray strikes surface

  2️⃣ Incident ray forms angle of incidence with normal

  3️⃣ Reflected ray forms angle of reflection with normal

  4️⃣ Angle of incidence equals angle of reflection

  5️⃣ Incident ray, reflected ray, and normal lie in the same plane
• The incident ray, reflected ray, and normal all lie in the same plane
• What type of surface is required for regular reflection?

  Smooth surface
• What happens to reflected rays in diffuse reflection?

  They scatter in directions
• Diffuse reflection follows the laws of reflection strictly.

  False
• Reflection off a rough wall is an example of diffuse reflection.
• The angle of incidence and reflection is always equal (i = r) for light
• Reflection of waves occurs when a wave bounces back from a surface without passing through
• What is the first law of reflection?

  i = r
• What type of surface is required for regular reflection?

  Smooth
• Diffuse reflection occurs when waves bounce off a smooth surface.

  False
• The angle of incidence and reflection is always equal (i = r) for light
• Sound reflection, unlike light reflection, requires a medium.


  True