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05 – The Law Of Reflection

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**What happens when waves hit a boundary?**

When water waves strike a barrier straight on, they reflect back along the same path.

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**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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**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.

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

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EXAMPLES Example 1: Find the angle of reflection

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Examples Example 2: Find the angle of reflection

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

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