Moving one mirror of a Michelson interferometer through 0.5 mm shifts 2000 fringes across the field of view. What is the wavelength of the light?
Correct answer B. 5000 Å
Explanation
Each fringe corresponds to a mirror movement of λ/2, so λ = 2d/N = 2 × 0.5 mm ÷ 2000 = 5 × 10⁻⁷ m, which is 500 nm or 5000 Å.
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