Question

A light source emits visible light of two wavelengths λ = 430 nm and λ ′ = 510 nm . The source is used in a double slit interference experiment in which D =1.50 m and d = 0.025 mm . The separation distance between the third order bright fringes is ____________ mm . 

Answer 1

 The condition far maxima is

with n = 3, we find that the fringe positions corresponding to these two wavelengths are

Hence the separation distance between the two fringes is

Comments

this is very fantastic. thanks for helping a home test being given at our school