Question

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

• A. increases but becomes less bright
• B. decreases but becomes more bright
• C. increases but becomes more bright
• D. decreases but becomes less bright

Answer 1

Answer: (A)

increases but becomes less bright

Answer 2

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