Is Huygen's principle valid for longitudunal sound waves ? 

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Yes, Huygen's principle is true and valid for all types of waves.

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Explain the reflection of plane wavefront from concave mirror. 

Explain the reflection of a plane wave using Huygen's principle. 

You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.