Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when blue-green light of wavelength 500 nm is used?

Question

Philoid · Accepted Answer

Given:

Distance between slits(d) = 1 mm = 10^-3 m

Distance from screen(D) = 1 m

Wavelength of light used(λ) = 500 nm = 5 x 10^-7 m

Therefore, from results of Young’s double slit experiment,

fringe separation(β) = = 5 x 10^-4 m = 0.5 mm. (Ans)