Lesson: The Huygens Wave Model High School Physics

Physics

In this lesson, we will learn how to describe the processes of propagation, reflection, refraction, and diffraction using the Huygens wave model.

Worksheet

Q1:

The diagram shows a plane wave traveling in a medium 𝑚. The wave propagates as described by the Huygens wave model. The wave is incident at a boundary, beyond which there is a medium 𝑚. Which of the arrows shown correctly represents the direction of the wave traveling in 𝑚?

Q2:

The diagram shows a plane wave that is incident on a reflective surface. The wave propagates as described by the Huygens wave model. At an instant 𝑡, the dashed pink line is tangential to the wave fronts of wavelets emitted from equally separated point sources on the reflective surface. The interval Δ𝑡 is the time taken for a wavelet to travel through four wavelengths of the plane wave. Which of the following is the time at which the first wavelet is emitted from the reflective surface?

Q3:

The diagram shows a plane wave that is incident on a reflective surface. The wave propagates as described by the Huygens wave model. The points A, B, C, and D are point sources of wavelets emitted from the reflective surface.

How many wavelengths of the plane wave does the wave front of the wavelet that originates at point D travel to reach point H?

How many wavelengths of the plane wave does the wave front of the wavelet that originates at point B travel to reach point F?

The number of wavelengths of the plane wave that are traveled by the wave front of the wavelet that originates at point A to reach point E is 𝑛. The number of wavelengths of the plane wave that are traveled by the wave front of the wavelet that originates at point C to reach point G is 𝑛. What is the ratio of 𝑛 to 𝑛?

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