The angle between the incident and reflected rays is 20 °. What will the angle of reflection be if the angle of incidence

The angle between the incident and reflected rays is 20 °. What will the angle of reflection be if the angle of incidence is increased by 5 °? And the angle between the incident and reflected rays is 40 °. What will be the angle of reflection if the angle of incidence decreases by 10 °?

The falling angle is equal to the reflected
1) because the criminal between pad and neg is 20, then pad = neg = 20: 2 = 10
If you increase the pad by 5, then the neg will increase by 5, which means it will be equal to 15 degrees
2) 40: 2 = 20
20-10 = 10
10 degrees