In Young's double slit experiment D is the distance between slits and the screen d is the slit separation and A, is the wave length of light used, then the fringe spacing is given by:
Correct answer: A. λ D/d
- A. λ D/d
- B. λd/D
- C. d/λD
- D. Dd/λ
Explanation
In Young's double slit experiment, the fringe spacing is given by the formula λD/d. This formula indicates that the fringe spacing is directly proportional to the wavelength of light used and the distance between the slits and the screen, and inversely proportional to the slit separation. Therefore, Option A (λ D/d) is the correct answer. The other options provide variations of the formula with incorrect arrangements or multiplications of the terms, making them incorrect choices.
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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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