Menu Close

Problem 1: In a Young’s double slit experiment the separation of the slits is 1 mm and red light of wavelength 620 nm is falling on it. Determine the distance between the central bight band and the fifth bright fringe on the screen which is 3 m away from the slit.


Given data

Separation of slits = d = 10-3m
Incident wavelength (red light) = λ = 620 × 10-9m
No of bright fringes = m = 5
Distance in slits and screen = L = 3 m


Distance between central band and 5th fringe = Y =?

(Please note the perpendicular AD in the diagram is not that exact1)


Where Y is the distance between central point and 5th fringe which we want to find. Put the values,



  1. Pingback:Numerical Problem 2, Physical Optics, Physics 11 … msa – msa

  2. Pingback:Numerical Problems, Physical Optics, … msa – msa

  3. Pingback:Numerical problems on Physical Optics, Physics 11 – msa

Leave a Reply

Your email address will not be published. Required fields are marked *