
What is the effect on the fringe width of interference fringes in a Young's double slit experiment due to each of the following operations:
(a) The screen is moved away from the plane of the slits.
(b) the (monochromatic) source is replaced by another (monochromatic) source of shorter wavelength.
(c) The separation between the two slits is increased.
(d) The width of two slits is slightly increased.
[In each operation, take all parameters, other than the one specified to remain unchanged.]

Important Questions on Wave Optics




A flint glass and a crown glass are fitted on the two slits of a double slit apparatus. The thickness of the strips is and the separation between them is . The refractive index of flint glass and crown glass are , respectively, for light of wavelength which is used in the experiment. Interference is observed on a screen at a distance of one meter.
(a) What would be the fringe-width?
(b) At what distance from the geometrical centre will the nearest maximum be located?



