CBSE Class 12 Physics 2016 Outside Delhi Set 1 Paper

Question : 12

Total: 26

(i) State law of Malus.
(ii) Draw a graph showing the variation of intensity (I) of polarised light transmitted by an analyser with angle (θ) between polariser and analyser.
(iii) What is the value of refractive index of a medium of polarising angle 60∘ ?

Solution:

Statement
Plotting the graph
Calculating value of (µ) refractive index
(i) When the pass axis of a polaroid makes an angle θ with the plane of polarisation of polarised light of intensity I0 incident on it, then the intensity of the transmitted emergent light is given by I=I0 cos2θ
Note : If the student writes the formula I=I0cos2θ and draws the diagram give 1 mark
(ii)

(iii) ‌µ=tan‌iβ
‌=tan‌60∘=√3=1.7

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