Are the angle of reflection and angle of incidence also equal for reflection by curved surfaces ?

Why the angle of incidence is equal to angle of reflection ?

Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light ? For what angle of incidence is the reflected ray normal to the incident ray?

What are the values of angle of incidence (i) and that of reflection ( r ) for a normal incidence ?

How is the angle of reflection determined in Bragg's spectrometer method ?