The angle between an incident
ray and the mirror is 40°.
1) What is the angle of reflection?

1) 50°

Explanation:

We need to find the angle of incidence first before finding the angle of reflection.

Angle of incidence = 90° - 40°

                                = 50°

Since the angle of incidence is the same as the angle of reflection, the angle of reflection here would be 50°.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

this is poiselle's equation from fluid mechanic in physics. mech eng