Question

Q9 part b

​Q9(b). In Young's double slit experiment, the two parallel slits are made 1mm apart and a screen is placed 1 m away. What is the fringe separation when blue green light of wavelength 500 nm is used.

Answer 1

$$\begin{gathered} Q9Thefringewidth=\frac{nD\lambda }{d} \\ =\frac{1\times 500\times {10}^{-9}}{{10}^{-3}}=5\times {10}^{-4}m \\ Regards \end{gathered}$$