Q. 175.0( 1 Vote )

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?

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)


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