Question

# A vertically polarized beam of light, having intensity 100 W/m , is incident on a stack...

1. A vertically polarized beam of light, having intensity 100 W/m , is incident on a stack of

identical linear polarizers that are arranged one behind the other so that the transmission axis

∘∘ ofthefirstisvertical,thesecondat45,thethirdat90 withthevertical.(i)Findtheintensity

of the emerging beam, which will be oscillating in a direction perpendicular to the incident one.

(ii) If we would like to rotate a polarized beam of light through an angle 90 , we can use a

similar stack with N polarizers. What is the least number of polarizers needed to have the

,
intensity of the emerging light higher than 85 W/m . (iii) Can we rotate the polarized beam

emerging from the first polarizer, through an angle 90 , by replacing the stack of linear

polarizers with a half-wave plate (HWP)? What angle will its slow axis make with the vertical direction? Validate your response using Jones matrices.

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