In Young's double slit experiment, if the distance between slits and screen is halved the separation between the slits doubled, then the fringe spacing will be:
Correct answer: D. One fourth
- A. Doubled
- B. Halved
- C. Four times
- D. One fourth
Explanation
β = λ D / d. If D → D/2 and d → 2d, new β' = λ (D/2) / (2d) = β/4. Thus, fringe spacing becomes one-fourth, option (d).
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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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