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(D) Huygens' principle is a geometric construction used to determine the position of a new wavefront at a later time based on the current wavefront. I

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Spectral patterns

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(D) Huygens' principle is a geometric construction used to determine the position of a new wavefront at a later time based on the current wavefront. It successfully explains the laws of reflection and refraction. It also explains the phenomenon of diffraction by considering each point on the wavefront as a source of secondary wavelets. However,Huygens' principle (in its original form) does not explain the origin of spectral patterns (like the photoelectric effect or the discrete nature of atomic spectra),as these are quantum mechanical phenomena that require the concept of photons and energy quantization,which are beyond the scope of classical wave theory.

Which of the following phenomena cannot be explained by Huygens' principle?

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