In Young's double slit experiment, if d is the separation between slits, D is the distance of screen from the slits, then the position of m-th bright fringe ym will be:
Correct answer: C. m(D λ / d), where m=0,1,2,3,...
- A. (m+1/2) Dλ / d, where m=0,1,2,3,...
- B. (m-1/2) Dλ / d, where m=0,1,2,3,...
- C. m(D λ / d), where m=0,1,2,3,...
- D. (m+1/2) d / Dλ , where m=0,1,2,3,...
Explanation
Bright fringes occur at yₘ = mλD/d from the central maximum. This comes from constructive interference, d sinθ = mλ. For small angles, sinθ ≈ y/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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