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If single slit is illuminated by white l...

If single slit is illuminated by white light, what will be the nature of colour of the diffraction pattern?

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If single slit is illuminated by white light, the central maximum of the diffraction pattern is produced due to the reinforcement of the diffracted waves having same phase but different wavelengths. So the central maximum will be of white colour. But in case of secondary maxima on either sides of the central maximum, the angle of diffraction `theta prop (lambda)/(a),` if `theta` is taken very small.
Since `lambda_( r) gt lambda_(v), " " so," " theta_( r) gt theta`
Hence the secondary maxima will be coloured. The inner portion of each maximum will be of violet colour and the outer portion will be of red colour.
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