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Question

(B) The phenomenon of interference in thin films occurs when the path difference between the reflected rays is comparable to the wavelength of visible

Vedclass · Accepted Answer

$10^{-3}\,mm$

Vedclass · Answer

(B) The phenomenon of interference in thin films occurs when the path difference between the reflected rays is comparable to the wavelength of visible light.Visible light has a wavelength range of approximately $400\,nm$ to $700\,nm$, which is $4 	imes 10^{-7}\,m$ to $7 	imes 10^{-7}\,m$.Converting this to millimeters, we get $4 	imes 10^{-4}\,mm$ to $7 	imes 10^{-4}\,mm$.Among the given options, $10^{-3}\,mm$ (which is $10^{-6}\,m$ or $1\,\mu m$) is the only value that is of the same order of magnitude as the wavelength of visible light.Therefore, the correct option is $B$.

The approximate thickness of an oil film required to observe the interference of light (due to which it appears coloured) is .......

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