JEE Main 20137 April
- Exam
- JEE Main
- Year
- 2013
- Date
- 7 April
- Subject
- Physics
- Chapter
- Wave Optics
JEE Main 2013 · 7 April · Physics · Wave Optics
A beam of unpolarised light of intensity I _ 0 is passed through a...
A beam of unpolarised light of intensity is passed through a polaroid and then through another polaroid which is oriented so that its principle plane makes an angle of relative to that of . The intensity of the emergent light is:
Options
- A
- B
- C
- D
Correct answer
A.
Step-by-step solution
Relation between intensities is
{\text{I}}_{\text{R}} = \left(\dfrac{{\text{I}}_{0}}{2}\right) {\text\cos}^{2} \left({\text{45}}^{\text{o}}\right) = \dfrac{{\text{I}}_{0}}{2} × \dfrac{1}{2} = \dfrac{{\text{I}}_{0}}{4}
{\text{I}}_{\text{R}} = \left(\dfrac{{\text{I}}_{0}}{2}\right) {\text\cos}^{2} \left({\text{45}}^{\text{o}}\right) = \dfrac{{\text{I}}_{0}}{2} × \dfrac{1}{2} = \dfrac{{\text{I}}_{0}}{4}