STANDARDPhysics-Wave Optics
STANDARD Physics Young's Double Slit Experiment MCQ Question
Type: MCQ-numerical-Medium-Class 12
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
A
1.3
B
4.3
C
7.9
D
9.5
Correct Answer
Option C
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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