Physics

Problem

In a Young’s double-slit arrangement, the slits are separated by

d = 0.25\,\text{mm}

and the screen is

D = 1.0\,\text{m}

away. Light of wavelength

\lambda = 500\,\text{nm}

is used. The whole apparatus is immersed in a liquid of refractive index

1.25

, and simultaneously a glass plate of thickness

t = 2\,\mu\text{m}

and refractive index

1.5

is introduced in front of one slit. What is the net displacement of the central bright fringe on the screen with respect to its original position in air before these changes? a) 2.5 mm b) 4.0 mm c) 2.0 mm d) 1.6 mm

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