question_answer

The graph showing the dependence of intensity of transmitted light on the angle between polariser and analyser, is

A)  

B)

C)                

D)                

Correct Answer: B

Solution :

According to law of Malus, when a beam of completely plane polarised light is incident on an analyser, the resultant intensity of light \[\mu k\] transmitted from the analyser varies directly as the square of the cosine of the angle \[^{40}Ar\] between planes of transmission of analyser and polariser. ie,            \[^{40}k\] and        \[2.95\times {{10}^{11}}yr\]          ??.(i) where \[2.95\times {{10}^{9}}yr\] = intensity of the light from polariser. From Eq. (i), we note that if the transmission axes of polariser and analyser are parallel (ie, \[4.37\times {{10}^{9}}yr\] or \[4.37\times {{10}^{11}}yr\]), then \[\sigma \] means that intensity of transmitted light is maximum. When the transmission axes of polariser and analyser are perpendicular (ie, \[\rho \]), then \[\lambda \]. It means the intensity of transmitted light is minimum. On plotting a graph between \[I\] and \[\theta \] as given by relation (i), we get the curve as shown in figure.