In Young's double slit experiment, two narrow slits 0.8 mm apart are illuminated by the same source of yellow light (l = 5893 Å). If the distance between the slits and screen is 2m, then the separation between adjacent bright lines will be:
Correct answer: C. 1.473 mm
- A. 14.73 mm
- B. 14.73 cm
- C. 1.473 mm
- D. 147.3 mm
Explanation
Fringe spacing β = λD/d = (5893×10⁻¹⁰ m × 2 m)/(0.8×10⁻³ m) ≈ 1.473×10⁻³ m = 1.473 mm. So option (C) is the correct fringe separation.
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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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