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  • A beam of light travelling in water falls on a glass plate immersed in water. When the incident angle is <img alt="51^{\circ}" src="https://entrancecorner.oncodecogs.com/gif.latex?51%5E%7B%5Ccirc%7

A beam of light travelling in water falls on a glass plate immersed in water. When the incident angle is 51^{\circ}, the reflected beam of light is found to be completely plane polarised. The refractive index of glass is: (Given refractive index of water = 4/3)

Option: 1

1.091


Option: 2

2.312


Option: 3

1.647


Option: 4

5.734


Answers (1)

best_answer

Refractive index of glass w.r.t. water,
\mathrm{\begin{aligned} & \mu_s=\tan i_p=\tan 51^{\circ}=1.235 \\ & \therefore \quad{ }^a \mu_g={ }^w \mu_g \times{ }^a \mu_w=1.235 \times \frac{4}{3}=1.647 \end{aligned}}

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Anam Khan

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