21 The refractive index of a thin film is 1 42 If it is

Last updated: 6/11/2023

21 The refractive index of a thin film is 1 42 If it is illuminated by sodium light 2 5 9x107 meter find the minimum thickness of the film to be appear black in reflected light A 2 07X10 meter B 2 07X10 meter C 2 07X10 meter D 2 07X10 meter DO DO