The law of reflection states that if the angle of incidence is 50 degrees, the angle of reflection is degrees.

50°

Explanation:
The law of reflection states that when a ray of light falls of a plane mirror or a smooth conducting surface, the angle of incidence is equal to the angle of reflection.

This law can be illustrated using the attached diagram where i = r

Now, for the given:
angle of reflection = angle of incidence = 50°

Hope this helps :)

Exothermic,  physical change after it is already baked