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When one light ray is reflected from a plane mirror with 30$$^\circ$$ angle of reflection, the angle of deviation of the ray after reflection is:
$$\text{By the law of reflection, the angle of incidence equals the angle of reflection: } i = r = 30^\circ$$
$$\delta = 180^\circ - (i + r)$$
$$\delta = 180^\circ - (30^\circ + 30^\circ) = 180^\circ - 60^\circ = 120^\circ$$
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