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An unpolarized beam of light with intensity 76.7 lx is incident on three ideal polarizing filters....

An unpolarized beam of light with intensity 76.7 lx is incident on three ideal polarizing filters. The polarizing axis of the first filter (filter A) makes an angle of 30 degree with the vertical and the axis of the second filter (filter B) makes an angle of  81 degree with the vertical. The third filter (filter C) is oriented so that its polarizing axis is horizontal.

(a) What is the intensity of the light after it passes through the first filter?

Note: Light passes polarizing filters in the following order A, B, and C.

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