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05 – The Law Of Reflection

05 – The Law Of Reflection. What happens when waves hit a boundary?. When water waves strike a barrier straight on, they reflect back along the same path. What happens when waves hit a boundary?. When incident waves strike a parabolic surface, the waves reflect to a focal point.

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05 – The Law Of Reflection

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  1. 05 – The Law Of Reflection

  2. What happens when waves hit a boundary? • When water waves strike a barrier straight on, they reflect back along the same path.

  3. What happens when waves hit a boundary? • When incident waves strike a parabolic surface, the waves reflect to a focal point.

  4. What happens when waves hit a boundary at an angle? • When incident waves strike a barrier at an angle they reflect off at the same angle. • The Normal (N)is a line drawn perpendicular to the barrier/surface the wave hits. The normal line intersects the surface at the identical point the wave hits the barrier/surface. • The Angle of Incidence,θi , of a wave is the angle measured from the incident wave (i) to a line normal to the barrier/surface. • The Angle of Reflection, θr , of a wave is the angle measured between the reflected wave (r) and a line normal to the barrier/surface.

  5. The Angle of Incidence is equal to the Angle of Reflection The Law of Reflection

  6. Example 1: • Find the angle of reflection EXAMPLES

  7. Example 2: • Find the angle of reflection Examples

  8. Example 3: • Determine which surface in the diagram the wave reflects from last and find the angle of reflection from that surface. Examples

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