Question

At what angle of incidence will the light reflected from glass $(\mu =1.5)$ be completely polarised

• A. ${72.8}^{\circ }$
• B. ${51.6}^{\circ }$
• C. ${40.3}^{\circ }$
• D. ${56.3}^{\circ }$

Answer 1

Answer: (D)

${56.3}^{\circ }$

Brewster's angle(Angle between Reflected and Refrected ray from the glass is ${90}^o$ ) is given as

$tan\theta =\frac{n_2}{n_1}$

$n_2$=1.5

$n_1=1$ for air

$\theta =56.30$