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  4. A ray of light travelling in the direction (1/2)( hati+√3 hatj) is incident on a plane mirror. After reflection, it travels along the direction (1/2)( hati-√3 j). The angle of incidence is

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Q. A ray of light travelling in the direction $\frac{1}{2}(\hat{i}+\sqrt{3} \hat{j})$ is incident on a plane mirror. After reflection, it travels along the direction $\frac{1}{2}(\hat{i}-\sqrt{3} j)$. The angle of incidence is

JEE AdvancedJEE Advanced 2013Ray Optics and Optical Instruments

Solution:

Angle between given rays is $120^{\circ}$, so angle of incidence is $30^{\circ}$
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