A paralIel beam of unpolarized light is incident on a plane glass of refractive index 1.60 at an angle to the normal. If the reflected beam is completely po...
Question 1 Report
A paralIel beam of unpolarized light is incident on a plane glass of refractive index 1.60 at an angle to the normal. If the reflected beam is completely polarized, calculate the angle of incidence of the beam.
Answer Details
When the reflected beam is completely (plane) polarised, the angle of incidence equals the polarising angle (Brewster's angle) \(\theta_p\), given by Brewster's law:
\[ n = \tan \theta_p \]Making \(\theta_p\) the subject:
\[ \theta_p = \tan^{-1}(n) = \tan^{-1}(1.60) \] \[ \theta_p = 57.99^{\circ} \approx 58.0^{\circ} \]The angle of incidence of the beam is about \(58^{\circ}\).
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