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A ray of light incidents on a plane mirror at an angle of $30^{\circ}$. The deviation produced in the ray is
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$60^{\circ}$
given, incident angle is $30^{\circ}$.
Deviation angle $=d=2 \theta$
where $\mathrm{d}$ is the angle of deviation and $\theta$ is the angle of incidence. $\mathrm{d}=2 \times 30^{\circ} .=60^{\circ}$
Deviation angle $=d=2 \theta$
where $\mathrm{d}$ is the angle of deviation and $\theta$ is the angle of incidence. $\mathrm{d}=2 \times 30^{\circ} .=60^{\circ}$
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