Home Physics Wave Optics NCERT Exampler Consider sunlight incident on a slit of widt…
Physics Wave Optics NCERT Exampler MCQ (Single Correct)

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

A
Be a fine sharp slit white in colour at the centre
B
A bright slit white at the centre diffusing to zero intensities at the edges
C
A bright slit white at the centre diffusing to regions of different colours
D
Only be a diffused slit white in colour

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Verified by Experts
The correct answer is:
A

Given, width of the slit
Wavelength of (visible) sunlight varies from to .
As the width of slit is comparable to that of wavelength, hence diffraction occurs with maxima at center. So, at the center all colours appear, i.e., mixing of colours form white patch at the center.

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