If the angle between the pass axes of a polariser and analyser is `45^@` . Write the ratio of the intensities of original light and the transmitted light after passing through the analyser.

Explanation

If `I_0` is intensity of original light, then intensity of light passing through the polariser ` = (I_0)/(2)` . Intensity of light passing through analyser.
`I = (I_0)/(2) cos^(2 ) 45^@ rArr (I_0)/(I) = (2)/(cos^(2) 45^@) = 4/1`