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Reflection and Refraction

Reflection and Refraction. Bouncing Wave. The medium for waves is not always uniform. Extreme case is for a collision with a barrier. A single pulse is reflected back in the opposite direction. Open Ended. The medium may end in air. Extreme case the end is loose and completely free.

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Reflection and Refraction

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  1. Reflection and Refraction

  2. Bouncing Wave • The medium for waves is not always uniform. • Extreme case is for a collision with a barrier A single pulse is reflected back in the opposite direction.

  3. Open Ended • The medium may end in air. • Extreme case the end is loose and completely free A single pulse is reflected back in the same direction.

  4. Mixed Media • The medium may change. • A thin rope attached to a thick rope Part of the pulse is reflected but part is transmitted.

  5. Waves can be seen as sets of parallel lines moving forward. Wave fronts May be curved A ray follows a point of successive wave crests. Perpendicular to front Straight until a barrier is reached Ray Tracing

  6. Perfect Mirror • Larger waves also interact with barriers. We can follow a line perpendicular to the wave front. • These are called rays • A reflected ray has the same angle after reflection. • Angle qi = qr

  7. Rough Shoulder • A car approaches a sandy shoulder from pavement. • The wheels that hit the shoulder slow down • An angle causes the car to turn into the shoulder

  8. Refraction • As a wave changes its medium the speed changes, and so does its wavelength.

  9. Snell’s Law • For plane waves the angles are related to the speeds in the two media. • This is called Snell’s Law next

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