Unpolarized light of intensity 13 mW/m 2 is sent into a polarizing sheet as in t

Question

Unpolarized light of intensity 13 mW/m2 is sent into a polarizing sheet as in the figure. What are (a) the amplitude of the electric field component of the transmitted light and (b) the radiation pressure on the sheet due to its absorbing some of the light?

Unpolarized light of intensity 13 mW/m2 is sent into a polarizing sheet as in the figure. What are (a) the amplitude of the electric field component of the transmitted light and (b) the radiation pressure on the sheet due to its absorbing some of the light?

Explanation / Answer

Given intensity of Unpolarized light Io= 13mW/m2 = 13 *10-3W/m2 velocity of light c = 3*108m/s permeability constant ?o =1.26 *10-12 H/m --------------------------------------------------------------------------- Intensity of light afterpassing throught the polarizer is given by I = Io /2 = 6.5*10-3W/m2 rms value of the electric field is given by Erms = ? ( I c ?o) Amplitude of the electric field is given by Em = ?2 Erms = ? ( 2 I c?o) = 2.21*10^(-3) m ---------------------------------------------------------------- b) The radiation pressure on the sheetdue to it absorbing some of the light is given by P = I /c = 6.5*10-3 / 3*108 = 2.16*10^(-11) W/m.s

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