The angle between incident ray and reflected ray is 80 degrees. What is the value of angle of incidence?

The angle of incident ray is 40°.

Explanation:

Given that the angle of incident and reflected ray are the same. In this question, we had given that both angles added up will gives you 80° so you have to divide it by 2 :

incident + reflected = 80°

Let incident = reflected = θ

θ + θ = 80°

2θ = 80°

θ = 80° ÷ 2

= 40°

a and c

c is 100% but i am confused in a

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle