AIIMS2009Physics-Wave Optics
AIIMS 2009 Physics Young's Double Slit Experiment MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In Young's double slit experiment, the two slits act as coherent sources of equal amplitude a and of wavelength λ. In another experiment with the same set up, the two slits are sources of equal amplitude a and wavelength λ, but are incoherent. The ratio of intensities of light at the mid point of the screen in the first case to that in the second case is
A
2 : 1
B
1 : 2
C
3 : 4
D
4 : 3
Correct Answer
Option A
Detailed Explanation
When sources are coherent, intensity at mid point is I_max = (a + a)^2 = 4a^2
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