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Consider a light ray travelling in air is incident into a medium of refractive index n 2 . The incident angle is twice that of refracting angle. Then, the angle of incidence will be:

1. ( ) n sin 1 −
2. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 2 n cos 1
3. ( ) n 2 sin 1 −
4. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 2 n cos 2 1

Correct answer: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 2 n cos 2 1

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