Question

Define (a) coherent radiation (b) superposition principle (c) refractive index of a medium (d) normal dispersion of a substance (e) anomalous dispersion (f) work function of substance(g) photo electric effect(h )ground state of molecule(i )electronic excitation (j ) fluroscence(k) (l)phosphorence (m) transmittance (n)absorptivity (o)absorptance (p) vibrational relaxations (q) stokes shift