A mica strip and a polysterence strip are fitted on the two slite of a double slit apparatus. The thickness of the strips is 0.50 mm and the separation between the slits is 0.12 cm. The refractive index of mica and polysterene are 1.58 and 1.55 respectively for the light of wavelength 590 nm which is used in the experiment. The interference is observed on a screen a distance one meter away. (a) What would be the fringe- width ? (b) At what distance from the centre will the first maximum be located ?

Options

A. 0.021 cm on the one side and 0.028 cm on the other side
B. 0.042 cm on the side and 0.048 cm on the other side
C. 0.042 cm on the one side and 0.028 cm on the other side
D. 0.021 cm on one side and 0.048 cm on the other side

Answer

A