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Zeeman in 1896 observed that the spectral lines are split up into components when the source emitting those spectral lines is placed in a strong magnetic field. He further observed that these components are polarized. The two types of Zeeman effect have been observed which are known as normal Zeeman effect and anomalous Zeeman effect. The schematic diagram of experimental arrangement for observing normal Zeeman effect is shown in Figure 10.3.
FIGURE10.3 Schematic diagram of Zeeman effect