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Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to
be \frac{1}{2}. Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be \frac{1}{8}. The angle between polarizer A and C is :

  • Option 1)

    60o
     

  • Option 2)

     0o
     

  • Option 3)

    30o

  • Option 4)

    45o

 

Answers (1)

best_answer

\because \frac{I}{2}cos^{4}\theta =\frac{I}{8} 

or cos^{4}\theta =\frac{1}{4}
\therefore cos\theta =\frac{1}{\sqrt{2}}

or \theta = 45^{0}


Option 1)

60o
 

This is incorrect

Option 2)

 0o
 

This is incorrect

Option 3)

30o

This is incorrect

Option 4)

45o

This is correct

Posted by

Avinash

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