Optics Question 847

Question: Interference fringes were produced in Young’s double slit experiment using light of wave length 5000Ao . When a film of material 2.5×103cm thick was placed over one of the slits, the fringe pattern shifted by a distance equal to 20 fringe width. The refractive index of the material of the film is

Options:

A) 1.25

B) 1.33

C) 1.4

D) 1.513

Show Answer

Answer:

Correct Answer: C

Solution:

[c] n=(μ1)tDd but β=λDdDd=βλ

n=(μ1)tβ/λ

20β=(μ1)2.5×103(β/5000×108)

μ1=20×5000×1082.5×103μ=1.4



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