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An Abbe number is a number which represents the reciprocal of the dispersive power of a substance with transparent qualities.
Lines will be formed at the opposite side of the observer if the ruled surface of grating faces the collimator due to reflection
Grating, Mesh, Lattice, framework, Network.
65.6
fretwork, grating, grid, grille, latticework, mesh, network, openwork, reticulation, tracery, trellis, web,