According to the law of reflection of light, angle of incidence and angle of reflection are always equal. Angle of incidence is the angle made by the incident ray of light with a normal drawn to the reflecting surface. Similarly, the angle of reflection is the angle made by the reflected ray with a normal drawn to the surface of reflection. 

Here, the incident ray makes an angle of 40° with the normal to the reflecting surface and hence the angle of incidence is also 40°.

Using the law of reflection of light,

Angle of incidence =  angle of reflection = 40°.

Hence the angle of reflection is 40°, which means that the reflected ray will make an angle of 40° with the normal to the reflecting surface.

Hope this helps.