STANDARDPhysics-Wave Optics
STANDARD Physics Interference MCQ Question
Type: MCQ-numerical-Medium-Class 12
Two light waves superimposing at the mid-point of the screen are coming from coherent sources of light with phase difference 3π rad. Their amplitudes are 1 cm each. The resultant amplitude at the given point will be
A
5 cm
B
3 cm
C
2 cm
D
0
Correct Answer
Option D
Detailed Explanation
Resultant amplitude, A = √(A₁² + A₂² + 2A₁A₂ cos φ). Here, A₁ = A₂ = 1 cm, φ = 3π rad. Thus, A = √(1² + 1² + 2×1×1×cos 3π) = 0.
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