Ray optics fails when

The size of the obstacle is

5 c m

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The size of the obstacle is

3 c m

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The size of the obstacle is less than the wavelength of light

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(a) and (b) both

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Solution

The correct option is C The size of the obstacle is less than the wavelength of light
Ray optics fails if the size of the object of the order of the wavelength.

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To observed diffraction, The size of the obstacle

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