NEET · Physics · STD 12 - 10. Wave optics
An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then -
- A reflected light is completely polarized and the angle of reflection is close to \(60^{\circ}\)
- B reflected light is partially polarized and the angle of reflection is close to \(30^{\circ}\)
- C both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to \(60^{\circ}\) and \(30^{\circ}\), respectively
- D transmitted light is completely polarized with angle of refraction close to \(30^{\circ}\)
Answer & Solution
Correct Answer
(A) reflected light is completely polarized and the angle of reflection is close to \(60^{\circ}\)
Step-by-step Solution
Detailed explanation
When unpolarised light is incident on a medium of refractive index 1.73 at Brewster's angle then reflected light is completely polarised.
Using Brewster's Law
\(\begin{array}{l}\mu=\tan \left(i_p\right) \\ 1.73=\tan \left(i_p\right) \\ i_p=60^{\circ}\end{array}\)
By Law of reflection,
\(i_p=r=60^{\circ}\)
Using Brewster's Law
\(\begin{array}{l}\mu=\tan \left(i_p\right) \\ 1.73=\tan \left(i_p\right) \\ i_p=60^{\circ}\end{array}\)
By Law of reflection,
\(i_p=r=60^{\circ}\)
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