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NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Wave Optics

NEET 2015 · Physics · Wave Optics

Two slits in Young's experiment have widths in the ratio 1 : 25....

Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, \dfrac{{I}_\max}{{I}_\min} is:

Options

  1. A12149\dfrac{121}{49}
  2. B49121\dfrac{49}{121}
  3. C49\dfrac{4}{9}
  4. D94\dfrac{9}{4}

Correct answer

D. 94\dfrac{9}{4}

Step-by-step solution

I1I2=251⇒A1A2=51\dfrac{{I}_{1}}{{I}_{2}} = \dfrac{25}{1} ⇒ \dfrac{{A}_{1}}{{A}_{2}} = \dfrac{5}{1}

\dfrac{{A}_\max}{{A}_\min} = \dfrac{5 + 1}{5 - 1} = \dfrac{6}{4} = \dfrac{3}{2}

\dfrac{{I}_\max}{{I}_\min} = {\left(\dfrac{3}{2}\right)}^{2} = \dfrac{9}{4}
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