P6 - Waves

P6 - Waves

1. reflection

   • is the throwing back by a body or surface of light, heat, or sound without absorbing it.
   • Waves - including sound and light - can be reflected at the boundary between two different materials. The reflection of sound causes echoes. The law of reflection states that: angle of incidence = angle of reflection For example, if a light ray hits a surface at 32°, it will be reflected at 32°.
   • diffuse reflection
     • If a surface is rough, diffuse reflection happens. Instead of forming an image, the reflected light is scattered in all directions. This may cause a distorted image of the object, as occurs with rippling water, or no image at all. Each individual reflection still obeys the law of reflection, but the different parts of the rough surface are at different angles.

2. reflection

   • diffuse reflection
     • If a surface is rough, diffuse reflection happens. Instead of forming an image, the reflected light is scattered in all directions. This may cause a distorted image of the object, as occurs with rippling water, or no image at all. Each individual reflection still obeys the law of reflection, but the different parts of the rough surface are at different angles.
   • Waves - including sound and light - can be reflected at the boundary between two different materials. The reflection of sound causes echoes. The law of reflection states that: angle of incidence = angle of reflection For example, if a light ray hits a surface at 32°, it will be reflected at 32°.

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