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Solution


Q.

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster’s angle. Then          [2025]
1 both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to 60° and 30°, respectively.  
2 transmitted light is completely polarized with angle of refraction close to 30°  
3 reflected light is completely polarized and the angle of reflection is close to 60°  
4 reflected light is partially polarized and the angle of reflection is close to 30°  

Ans.

(3)

Brewster's angle, tanθB=μ2μ1

where μ1 is the refractive index of air and μ2 is the refractive index of the given medium, μ2=1.73.

∴  θB=tan-1(1.73)≈60°

By law of reflection,

ip=r=60°

When an unpolarised light is incident on a medium of reflective index 1.73 at Brewster’s angle, then reflected light is completely polarised.