In a series of polaroids placed in such a way that optical axis of ...

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In a series of polaroids placed in such a way that optical axis of each polaroid makes same angle with the next one.
\( \mathrm{P} \) When unpolarized light falls on first and if no light is coming out from the last polaroid then by using how many number of W polaroids in series this can be achieved :
(A) 3
(B) 4
(C) 5
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