Two plane mirror AB and AC are inclined at an angle θ = 20°. A ray of light starting f....

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Two plane mirror AB and AC are inclined at an angle θ = 20°. A ray of light starting from point P is incident at point Q on the mirroe AB, then at R on mirror AC and again on S on AB finally the ray ST goes parallel to mirror Ac. The angle iwhich the ray makes with the normal at point Q on mirror AB is
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