Ray optics is valid, when characteristic dimensions are

Of the same order as the wavelength of light

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Much smaller than the wavelength of light

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Of the order of one millimeter

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Much larger than the wavelength of light

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Solution

The correct option is D
Much larger than the wavelength of light

Ray optics can only take place when the wavelength of light is smaller as compared to the dimensions of the object.
Object size should be larger than the wavelength of light.
Thus, the correct option is (D).

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Similar questions

ray optics is valid when characteristic dimensions are

1.of the same order as ell as wavelength of light

2.much smaller than wavelength of light

3. of the order of 1mm

much larger than wavelength of light

Which is valid when Fresnal distance is equal to D ( D =distance between the slit and screen]

Diffraction or ray optics

I know that diffraction is valid when it is much less than D ....

Greater than D then ray optics is valid

What if they are equal???

Pls ans in detail ☺

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