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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