The magnetic field of a beam emerging from a filter facing a flood light as given by math xmlns=...

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The magnetic field of a beam emerging from a filter facing a flood light as given by
math xmlns=http://www.w3.org/1998/Math/MathMLmiB/mimo=/momn12/mnmo×/momsupmn10/mnmrowmo-/momn8/mn/mrow/msupmisin/mimfencedmrowmn1/mnmo./momn20/mnmo×/momsupmn10/mnmn7/mn/msupmiz/mimo-/momn3/mnmo./momn60/mnmo×/momsupmn10/mnmn15/mn/msupmit/mi/mrow/mfencedmi mathvariant=normalT/mimtext. /mtext/math
 
The average intensity of the beam is
(a) \( 1.71 \mathrm{~W} \mathrm{~m}^{-2} \)
(b) \( 2.1 \mathrm{~W} \mathrm{~m}^{-2} \)
(c) \( 3.2 \mathrm{~W} \mathrm{~m}^{-2} \)
(d) \( 2.9 \mathrm{~W} \mathrm{~m}^{-2} \)
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