STANDARD Physics Young's Double Slit Experiment MCQ Question
Two slits are made one millimeter apart and the screen is placed one metre away. The fringe separation when blue green light of wavelength 500 nm is used is
5 × 10⁻⁴ m
2.5 × 10⁻³ m
2 × 10⁻⁴ m
10 × 10⁻⁴ m
Correct Answer
Detailed Explanation
Fringe width, β = (Dλ)/d. Here, D = 1 m, d = 1 × 10⁻³ m, λ = 500 nm = 5 × 10⁻⁷ m. Therefore, β = (1 × 5 × 10⁻⁷) / (1 × 10⁻³) = 5 × 10⁻⁴ m.
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