JEE MAIN - Physics (2005 - No. 22)
When an unpolarized light of intensity $${{I_0}}$$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is
$${1 \over 4}\,{I_0}$$
$${1 \over 2}\,{I_0}$$
$${I_0}$$
zero
Explication
$$I = {I_0}{\cos ^2}\theta $$
Intensity of polarized light $$ = {{{I_0}} \over 2}$$
$$ \Rightarrow $$ Intensity of untransmitted light $$ = {I_0} - {{{I_0}} \over 2} = {{{I_0}} \over 2}$$
Intensity of polarized light $$ = {{{I_0}} \over 2}$$
$$ \Rightarrow $$ Intensity of untransmitted light $$ = {I_0} - {{{I_0}} \over 2} = {{{I_0}} \over 2}$$