AAI ATC Junior Executive 2016 Shift 1 Paper

Question : 77 of 120

Marks: +1, -0

Interference fringes are observed with a biprism of refracting angle 1° and refractive index 1.5 on a screen 100 cm away form it. The wavelength of light used is 5890 Å. If the distance between the source and the biprism is 20 cm, the fringe width is: