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(i) State law of Malus. (ii) Draw a graph showing the variation of intensity (I) of polarised light transmitted by an analyser with angle (theta) between polariser and analyser. (iii) What is the value of refractive index of a medium of polarising angle 60^(@) ? |
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Answer» <P> Solution :(i) The intensity of polarised light transmitted through an analyser varies as the square of cosine of angle between plane of transmission of analyser and the plane of polariser. If `I_(0)` be the intensity of plane polarised light, then the intensity I. of the light emerging from the analyser is given by`I_(0)=Icos^(2)theta`. it is known as Malus.s law. (II) The graph showing the VARIATION of intensity I of polarised light transmitted by an analyser with angle q between polariser and analyser is shown in figure. (iii) `therefore`Polarising angle `i_(p)=60^(@)`. `therefore`Refractive index of the MEDIUM n=tan`i_(p)=tan60^(@)=SQRT3.` |
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