In Michelson's interferometer 792 bright fringes pass across the field of view when its movable mirror is displaced through 0.233 mm using the equation l = m λ / 2 the wavelength of light used is:
Correct answer: A. 588 nm
- A. 588 nm
- B. 348 nm
- C. 620 nm
- D. 400 nm
Explanation
Explanation: L = mλ / 2 λ = 2L / m = 2 × 0.233 × 10-3 / 792 = 2 × 233 × 10-6 / 792 = 466 × 10-6 / 792 = 0.588 × 10-6 m = 588 × 10-9 m λ = 588 nm
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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