In a Young’s double-slit arrangement

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

In a Young’s double-slit arrangement, the slits are separated by d=0.25 mmd = 0.25\,\text{mm} and the screen is D=1.0 mD = 1.0\,\text{m} away. Light of wavelength λ=500 nm\lambda = 500\,\text{nm} is used. The whole apparatus is immersed in a liquid of refractive index 1.251.25, and simultaneously a glass plate of thickness t=2 μmt = 2\,\mu\text{m} and refractive index 1.51.5 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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