Refractive indices of glass and water with respect to air are 1.54 and 1.33 respectively, Polarizing angle for a beam entering from glass to water is

Concept:

• The angle of incidence at which a beam of unpolarized light falling on a transparent surface is reflected as a beam of completely plane polarised light is called polarising or Brewster angle. It is denoted by ip.
• Brewster's law: It states that when a ray is passed through some transparent medium having refractive index μ at any particular angle of incidence, the reflected ray is completely polarized; and the angle between reflected and refracted ray is 90⁰.

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μ = tan θB = tan ipdd = \(\frac{\mu_1}{\mu_2}\)

Where μ = refractive index and θB is Brewster's angle or polarizing angle (ip).

Application:

We have,

μ₂ = 1.54

μ₁ = 1.33

Hence,

tan θ_B = 1.33/1.54 = 1.15

Now, θ_B = tan-1 (1.33/1.54)