(a) What is meant by plane polarised light ? An unpolarised light is incident at an angle \theta on the surface of glass of refractive index \mu. If the reflected and refracted rays are perpendicular to each other, then obtain the relationship between \mu and \theta.

(b) Two polaroids P_{1} and P_{2} are placed in a crossed position. Unpolarised light of intensityI_{0} is incident on P_{1} . If P_{2} is rotated through an angle \theta about the direction of propagation of light, keeping P_{1} fixed, plot the graph of intensity of light for 0^{\circ}<\theta <360^{\circ}which is (i) transmitted byP_{1} , and (ii) transmitted by P_{2} .

 

 

 
 
 
 
 

Answers (1)

(a)if the electric vector is confined to one particular plane, containing the direction of propagation it is referred to as plane-polarized light.

\\\mu=\frac{sin i}{sin r}=\frac{sin \theta}{sin (90-\theta)}=tan\theta(if\ i=\theta)

i) 

ii)

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