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Assertion : Diffraction is common in sound but not common in light waves.
Reason : Wavelength of light is more than the wavelength of sound.
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Reason : Wavelength of light is more than the wavelength of sound.
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The correct answer is:
If assertion is true but reason is false.
For diffraction of a wave, size of an obstacle or aperture should be comparable to the size of wavelength of the wave. As wavelength of light is of the order of $10^{-6} \mathrm{~m}$ and obstacle / aperture
of this size are rare, therefore, diffraction is not common in light waves. On the contrary, wavelength of sound is of the order of $1 \mathrm{~m}$ and obstacle / aperture of this size are readily available, therefore, diffraction is common in sound.
of this size are rare, therefore, diffraction is not common in light waves. On the contrary, wavelength of sound is of the order of $1 \mathrm{~m}$ and obstacle / aperture of this size are readily available, therefore, diffraction is common in sound.
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