Consider sunlight incident on a slit of width `10^(4) Å` . The image seen through the slit shallA. be a fine sharp slit white is colour at the centreB. a bright slit white at the centre diffusing to zero intensities at the edgesC. a bright slit white at the centre diffusing to regions of different coloursD. only be a diffused slit white in colour

Consider sunlight incident on a slit of width `10^(4) Å` . The image

1.	Consider sunlight incident on a slit of width `10^(4) Å` . The image seen through the slit shallA. be a fine sharp slit white is colour at the centreB. a bright slit white at the centre diffusing to zero intensities at the edgesC. a bright slit white at the centre diffusing to regions of different coloursD. only be a diffused slit white in colour
Answer» Correct Answer - A (a) Given, width of the slit `=10^(4)` Å `=10^(4)xx10^(-10)m=10^(-6) m=1 mu m` Wavelength of ( visible ) sunlight varies from 4000Å to 8000Å. As the width of slit is comparable to that of wavelength, hence diffraction occcurs with maxima at centre. So, at the central all colours appear i.e., mixing of colours form white patch at the centre.

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