A monochromatic light beam of wavelength λ is diffracted
b7t;r 1j+ qecl(f-r2edpp6jo at a single slit of width
tp2-p 6r1ljr7ej bq f eo(+cd;$b$. After passing the slit, a diffraction pattern is observed on a screen a large distance away. The width of the central maximum is $w$.
The screen is moved closer to the slit. Which of the following changes, done separately, could result in no change in $w$?