KVPY SX SB Exam 2012 Question Paper

Question : 40 of 120

Marks: +1, -0

An unpolarized beam of light of intensity 70 passes through two linear polarizers making an angle of 30° with respect to each other. The emergent beam will have an intensity

${3I_0}/4$
${√3I_0}/4$
${3I_0}/8$
${I_0}/8$

Validate

Solution:

\I_0 {––––––––▶}↖{\First}↙{\Polarizer}

\I_0/2{––––––––▶}↖{\Malus \law}↙{\II \polarizer} (\I_0/2)\cos^2 30°

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