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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
Unpolarized light falls on two polarizing sheets placed one after another. What should be the angle between pass axis of the sheets so that final transmitted light have one fourth intensity of incident light?
  • A
    $30^o$
  • B
    $0^o$
  • C
    $60^o$
  • ✓
    None of these
✓

Answer

Correct option: D.
None of these
d
After passing through first $I$ $=\frac{I_{0}}{2}$

$\frac{I_{0}}{4}=\frac{I_{0}}{2} \cos ^{2} \phi$

$\Rightarrow \cos ^{2} \phi=\frac{1}{2}$

$\cos \phi=\frac{1}{\sqrt{2}}$

$\Rightarrow \phi=45^{\circ}$

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