In a YDSE a parallel beam of light of wavelength 6000� is incident on slits at angle of
Channel: Doubtnut
Date: 09/02/2020

In a YDSE a parallel beam of light of wavelength 6000� is incident on slits at angle of incidence `30^(@)`. A and B are two thin transparent films each of refractive index 1.5. thickness of A is `20.4mum`. Light coming through A and B have intensities I and 4I resepctively on the screen. Intensity at point O which is symmetric relative to the slits is 3I. The central maxima is above O. (i). what is the maximum thickness of B to do so. Assuming thickness of B to be that found in part (i) answer the following parts. (ii). Find fringe width, maximum intensity and minimum intensity on screen. (iii). Dinstance of nearest minima from O (iv) intensity at 5 cm on either side of O.