A) Brewster's law
B) Lambert's law
C) Malus law
D) Bragg's law
Correct Answer: A
Solution :
Brewstefs law states that when ordinary light is incident on a transparent surface at polarizing angle \[({{i}_{p}})\] for that surface, the tangent of angle of polarisation is equal to the refractive index \[(\mu )\] of the medium of surface, that is, \[\mu =\tan {{i}_{p}}\]
Lambert's law concerns to rate of absorption of radiation as it travels deeper into a medium. It states that the intensity \[I\]of radiation falls off exponentially with distance d in the medium. \[I={{I}_{0}}{{\exp }^{-\alpha d}}\] Law of Malus states that intensity of light coming out of analyser is proportional to the square of the cosine of the angle between the plane of analyser and polariser. \[I={{I}_{0}}{{\cos }^{2}}\theta \] (d) According to Bragg's law if a beam of X-rays of wavelength \[\lambda \] is directed at a crystal with parallel crystal planes that are distance d apart, then the reflected X-rays from each plane undergo interference.
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