Two polarids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2

(a)Io2

(b) Io4

(c) Io8

(d) Io16

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