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Two plane mirrors AB and AC are inclined...

Two plane mirrors AB and AC are inclined at an angle `theta = 20^(@)`. A ray of light starting from point P is incident at point Q on the mirror AB, then at R on mirror AC and again on S on AB. Finally the ray ST goes parallel to mirror AC. The angle which the ray makes with the normal at point Q on mirror AB is

A

`20^(@)`

B

`30^(@)`

C

`40^(@)`

D

`60^(@)`

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