Two plane mirrors are inclined at an angle theta . A ray of light is incident on one mirror at an angle of incidence i . The ray is reflected from this mirror , falls on the second mirror from where it is reflected parallel to the first mirror. What is the value of i , the angle of incidence in terms of theta ? (a) 2theta-90° (b) 4theta-90° (c) theta-90° (d) 3theta-90°

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