Object appearance and colour


Various types of interaction of light with objects, namely reflection, refraction and scattering, with consequent effects on the physical appearance and colour of objects, have been discussed. Five mechanisms responsible for colour generation, namely physical phenomena (scattering, dispersion, diffraction and interference), atomic and molecular excitation, ligand field, molecular orbital and energy band transitions, are discussed with real world examples.

Key words

dispersion and diffraction of light; colour centre; ligand field; incandescence; scattering; light absorption

2.1 Introduction

When energy is created in an object, it may emit radiation. Electromagnetic radiation (EMR) is considered to be produced ...

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