A source of light is placed in front of a screen. Intensity of light on the screen in I. Two Polaroids P₁ and P₂ are so placed in between the source of light and screen that the intensity of light on screen in   $\raisebox{1ex}{$I$}\!\left/ \!\raisebox{-1ex}{$2$}\right..$ P₂ should be rotated by an angle of_______ (degrees) so that the intensity of light on the screen becomes  

<p>&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1815574569"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;</p><p><span class="mathml" contenteditable="false"> <math> <mrow> <mfrac> <mrow> <mi>l</mi> </mrow> <mrow> <mn>2</mn> </mrow> </mfrac> <mi>c</mi> <mi>o</mi> <msup> <mrow> <mi>s</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> <mi>? </mi> <mo>=</mo> <mfrac> <mrow> <mn>3</mn> <mi>l</mi> </mrow> <mrow> <mn>8</mn> </mrow> </mfrac> </mrow> </math> </span></p><p><span class="mathml" contenteditable="false"> <math> <mrow> <mo>? </mo> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mi>? </mi> <mo>=</mo> <mfrac> <mrow> <mroot> <mrow> <mn>3</mn> </mrow> <mrow></mrow> </mroot> </mrow> <mrow> <mn>2</mn> </mrow> </mfrac> </mrow> </math> </span></p><p><span class="mathml" contenteditable="false"> <math> <mrow> <mo>? </mo> <mi>? </mi> <mo>=</mo> <mn>3</mn> <mn>0</mn> <mo>°</mo> </mrow> </math> </span></p>

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