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QJEEM22Ph6795: JEE Main 2022 Physics - Class 12 JEEM22Ph6795 Solution: An unpolarised light beam of intensity is passed through a…

An unpolarised light beam of intensity 2I02 I_{0} is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of 30∘30^{\circ} relative to that of P. The intensity of the emergent light is

Multiple Choice Options

  • A I04\frac{\mathrm{I}_{0}}{4}
  • B I02\frac{\mathrm{I}_{0}}{2}
  • C 3I04\frac{3 I_{0}}{4}
  • D 3I02\frac{3 \mathrm{I}_{0}}{2}

Step-by-Step Verified Solution

JEE Main 2022 (Online) 29th July Evening Shift Physics - Wave Optics Question 51 English Explanation

I1=12(2I0)=I0\mathrm{I}_1=\frac{1}{2}\left(2 \mathrm{I}_0\right)=\mathrm{I}_0

I2=I1cos⁡230∘\mathrm{I}_2=\mathrm{I}_1 \cos ^2 30^{\circ}

=I0⋅34=3I04=\mathrm{I}_0 \cdot \frac{3}{4}=\frac{3 \mathrm{I}_0}{4}

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