Q80 / 160 · JIPMER 2014 · Physics

If the sun rays are incidenting at $60^{\circ}$ angle and intensity is $I$. If the sun rays are made incident at $30^{\circ}$ angle, then what will be the intensity?

  • A
    $\frac{I}{\sqrt{3}}$
  • Correct answer
    B
    $\sqrt{3} I$
  • C
    $3I$
  • D
    $\frac{I}{3}$

Solution

Ratio of intensities $\frac{I_1}{I_2}=\frac{\cos \theta_1}{\cos \theta_2}=\frac{\cos 60^{\circ}}{\cos 30^{\circ}}$ $I_2=\sqrt{3} I_1$

Hence, the correct answer is option: 'B'.

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