The drawing shows a light ray undergoing multiple reflections from a mirrored corridor. The walls of the corridor are either parallel or perpendicular to one another. If the initial angle of incidence is 35°, what is the angle of reflection when the ray makes its last reflection?

angle of reflection = 55 degree

Explanation:

As we know that wall corridor is perpendicular to each other

So we can say that here by law of reflection

angle of incidence = angle of reflection

also we know that

so on first side

the angle of incidence = angle of reflection = 35 degree

now on the perpendicular side

angle of incidence = 90 - 35

so angle of reflection = 55 degree