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A light ray is incident , at an inciden...

A light ray is incident , at an incident angle , `theta_(1)` , on the system of two plane mirros `M_(1)` and `M_(2)` having an inclination angle `75^(@)` between them (as show in figure). After reflecting from mirror `M_(1)` it gets reflected back by the mirror `M_(2)` with an angle of reflection `30^(@)`. The total deviation of the ray will be _____degree.

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