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A ray of light travelling in the direction ( ) j ˆ 3 i ˆ 2 1 + is incident on a plane mirror. After reflection, it travels along the direction ( ) j ˆ 3 i ˆ 2 1 − . The angle of incidence is

1. 30º
2. 45º
3. 60º
4. 75º

Correct answer: 30º

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