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Good afternoon sir. Answer is 3rd option. Explain it sir.
Good afternoon sir.Answer is 3rd option.Explain it sir.

```
2 years ago

```							let the refractive index be RI angle of from air to glass slab incidence = 45 degrees. let R1 be the angle of refraction sin(45 deg)/sin(R1) = Ri sin(R1) = sin(45 deg)/(Ri) angle of incidence of the ray on the vertical face of the slab as it travels through it is (90 degrees - R1) sin(90)/sin(90 deg -R1) = Ri (here angle of refraction should be 90 degrees because we need total internal reflection) 1/cos(R1) = Ri cos(R1) = 1/Ri using sin square theta + cos Square theta = 1, we have square(sin(45 deg)/Ri) + square(1/Ri) = 1 square(1/(sqrt(2)*Ri)) + square(1/Ri) = 1 1/(2*square(Ri) + 1/square(Ri) = 1 =3/(2*square(Ri) ) = 1 square(Ri) = 3/2 Hence Ri = sqrt(3/2)
```
2 years ago
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