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(D) Diffraction is the phenomenon of the bending or spreading of light around the corners of an obstacle or through an aperture.For significant diffra

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should be of the order of wavelength.

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(D) Diffraction is the phenomenon of the bending or spreading of light around the corners of an obstacle or through an aperture.For significant diffraction to occur,the size of the obstacle or the aperture must be comparable to the wavelength $( \lambda )$ of the incident light.If the size of the obstacle is much larger than the wavelength,the light travels in a straight line (rectilinear propagation),and diffraction is negligible.Therefore,the condition for observing diffraction is that the size of the obstacle should be of the order of the wavelength of light.

To observe diffraction,the size of the obstacle

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