Question

Solve this:
Q.18. Two slits are made 1 mm apart and the screen is placed 1 m away. What is the fringe separation when blue green light of wavelength 500 nm is used?

Answer 1

Dear Student ,
Here in this case ,
$$\begin{gathered} fringewidth,d=1mm \\ D=100cm \\ \beta =? \\ \lambda =5000\stackrel{0}{A} \\ Therefore,fringewidthis, \\ \beta =\frac{\lambda D}{d}=\frac{5000\times {10}^{-8}\times 100}{0·1}=0·05cm \end{gathered}$$
Regards