Question 162: Wave Optics

Question

A beam of unpolarised light of intensity ${{\rm I}_0}$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of ${45^ \circ }$ relative to that of $A$. The intensity of the emergent light is

Accepted Answer

Relation between intensities
${{m I}_r} = \left( {{{{{m I}_0}} \over 2}} ight){\cos ^2}\left( {{{45}^ \circ }} ight) = {{{{m I}_0}} \over 2} 	imes {1 \over 2} = {{{{m I}_0}} \over 4}$

Answer

${{\rm I}_0}$

Answer

${{{I_0}} \over 2}$

Answer

${{{I_0}} \over 4}$

Answer

${{{I_0}} \over 8}$

Wave Optics

A beam of unpolarised light of intensity {{\rm I}_0} is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of {45^ \circ } relative to that of A. The intensity of the emergent light is

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