Question
In the diffraction at a single slit experiment, how would the width and the intensity of central maximum change if (i) slit width is halved (ii) visible light of longer wavelength is used?
Solution
In a single slit experiment,
As, size of central max
Therefore,
i) When slit width is halved, size of the central maxima is doubled. Hence, intensity reduces to one-fourth of it's initial value.
ii) When longer wavelength is used, size of central maximum is increased. Hence, intensity reduces.
