Question

All objects reflect light falling on them,but brightness of different objects are different. Justify

Answer 1

Brifhtness of each and every object depend on the wavelength of light.More the wavelength more is the brightness and less the wavelength less is the brightness.

Answer 2

Visible light emitted or reflected from the object around us ,there exist coherent light and incoherent light . The laser is an example of coherent light ie, it can be described by a wave with a known amplitude and phase .