Answer:
Critical angle \[({{i}_{c}})\]. The angle of incidence in the denser medium for which the angle of refraction in the rarer medium is \[\text{9}0{}^\circ \] is called critical angle of the denser medium. Polarising angle \[({{i}_{p}})\]. The angle of incidence, at which when unpolarised light is incident on a transparent refracting medium, the reflected light becomes completely plane polarised, is called the polarising angle. The relation between the two angles is \[\tan {{i}_{p}}=\frac{1}{\sin {{i}_{c}}}.\]
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