A light ray is incident, at an incident angle $$\theta_1$$, on the system of two plane mirrors $$M_1$$ and $$M_2$$ having an inclination angle $$75°$$ between them (as shown 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.