Q126 / 180 · KCET 2012 · Physics

In single slit experiment, the width of the slit is reduced. Then, the linear width of the principal maxima

A
decreases but becomes less bright
Correct answer
B
increases but becomes less bright
C
decreases but becomes more bright
D
increases but becomes more bright

Solution

If width of slit is reduced in a single slit diffraction. Width of central maxima $\beta=\frac{2 \lambda \mathrm{D}}{\mathrm{a}}$ will increase but intensity of central maxima will decrease less number of waves will superpose at the centre.

Hence, the correct answer is option: 'B'.

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