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  • Consider the sunlight incident on a slit of width   . The image seen through

Consider the sunlight incident on a slit of width  \mathrm{10^4 \AA} . The image seen through the slit shall: 

Option: 1

be a fine sharp slit white in colour at the centre


Option: 2

a bright slit white at the centre diffusing to zero intensities at the edges


Option: 3

a bright slit white at the centre diffusing to regions of different colours


Option: 4

only be a diffused slit white in colour


Answers (1)

best_answer

Given, width of the slit \mathrm{=10^4 \AA}

\mathrm{ =10^4 \times 10^{-10} \mathrm{~m}=10^{-6} \mathrm{~m}=1 \mu \mathrm{m} }
Wavelength of (visible) sunlight varies from \mathrm{4000 \, \AA} to \mathrm{8000\, \AA.} As the width of slit is comparable to that of wavelength, hence diffraction occurs with maximum at centre. So, at the centre all colours appear i.e., mixing of colours from white patch at the centre.

Posted by

Deependra Verma

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