Diffuse reflection occurs from dull surfaces while regular reflection occurs from mirror type surfaces. As the frequency of a wave increases its energy increases and its wavelength decreases. Transverse wave particles vibrate back and forth perpendicular to the wave direction. Wave behavior is proven by diffraction, interference and the polarization of light. Shorter waves with higher frequencies have shorter periods.
Monochromatic light has one frequency.
Coherent light waves are all in phase. Real images are always inverted. Virtual images are always upright. The particle behavior of light is proven by the photoelectric effect. Large objects have very short wavelengths when moving and thus can not be observed behaving as a wave.