How is the interference pattern affected when violet light replaces sodium light?
How is the interference pattern affected when violet light replaces sodium light?
The fringes become brighter.
The fringes become faint.
Fringewidth decreases.
Fringewidth increases.
Solution
In Young's double slit experiment, Fringe width $\mathrm{W}=\frac{\lambda \mathrm{D}}{\mathrm{d}}$
As violet light is of smaller wavelength Fringe width decreases