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JEE Main 2014 (11 Apr, Shift 1) · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from JEE Main 2014 (11 Apr, Shift 1)

Q96JEE Main 2014 · 11 APR · SHIFT 1Easy

Superposition, Coherence & Intensity

Two monochromatic light beams of intensity 16 and 9 units are interfering. The ratio of intensities of bright and dark parts of the resultant pattern is:

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Answer: (d)

Amplitudes $\propto \sqrt{I}$ : $\sqrt{16} = 4$ , $\sqrt{9} = 3$ .
$\frac{I_{max}}{I_{min}} = \left(\frac{4+3}{4-3}\right)^2 = 49$
So the answer is (d) $\frac{49}{1}$ .

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