Question

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

Answer 1

Brightness of a object depends upon the colour of the object.
Greater the wave length of the colour, greater the brightness...
The red light has more wavelength and it is therefore most brightest among each colour.
When light reflects after falling on the object, the colour of the object which has more wavelength reaches our eye faster and we feel it more brighter...