Question

Two parallel slits 1 mm apart are placed 1 metre away from screen. What is the fringe separation due to interference effect, when a beam of wavelength 500 nanometer is incident on them?

Answer 1

Solution :

Given d=1mm

=1×10−3m

D=m

λ=500nm

=5×10−7m

β=λDd

=5×10−7×110−3

=0.5mm