A glass flake of refractive index is placed over one opening of a double-slit apparatus
PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
A glass flake of refractive index 1.5 is placed over one opening of a double-slit apparatus. The interference pattern is displaced through seven successive maxima towards the side where the flake is placed. If the wavelength of light is λ=600nm, the thickness of the flake is
(1) 2100nm
(2) 4200nm
(3) 8400nm
(4) None of these