STANDARD Physics Young's Double Slit Experiment MCQ Question
In Young's double slit experiment, light waves of wavelength 5.4 × 10² nm and 685 nm are used in turn, keeping the same geometry of the set up. The ratio of the fringe widths in two cases is
1.3
4.3
7.9
9.5
Correct Answer
Detailed Explanation
Fringe width, β = (Dλ)/d. The ratio β₁/β₂ = λ₁/λ₂ = 5.4 × 10² / 685 = 0.79. Therefore, the ratio is approximately 7.9.
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