If the movable mirror in an interferometer is moved through 2 wavelengths, the number of fringes observed is:
Correct answer: C. 2
- A. 1
- B. 3
- C. 2
- D. 4
Explanation
The correct option is C because When the movable mirror in an interferometer is moved through a distance equal to an integer number of wavelengths, the number of fringes observed will be even. Therefore, if the mirror is moved through 2 wavelengths, two fringes (one bright and one dark) will be observed.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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