A screen is placed $0.5 \mathrm{~m}$ away from a single slit which is illuminated by a monochromatic light…
A screen is placed $0.5 \mathrm{~m}$ away from a single slit which is illuminated by a monochromatic light of wave length $6000 Å$. If the distance between the first and third minima in the diffraction pattern on the screen is $3 \mathrm{~mm}$ then the slit width is