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(B) According to Brewster's Law,when a beam of unpolarised light is incident on a transparent dielectric surface,the reflected light is completely pla

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(B) According to Brewster's Law,when a beam of unpolarised light is incident on a transparent dielectric surface,the reflected light is completely plane-polarised if the angle of incidence is equal to the Brewster's angle $(i_p)$.Brewster's Law is given by the formula: $\mu = 	an(i_p)$.Given the refractive index $\mu = \sqrt{3}$.Therefore,$	an(i_p) = \sqrt{3}$.Since $	an(60^o) = \sqrt{3}$,the angle of incidence $i_p = 60^o$.

$A$ parallel beam of monochromatic unpolarised light is incident on a transparent dielectric plate of refractive index $\mu = \sqrt{3}$. The reflected beam is completely polarised. Then the angle of incidence is....$^o$

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