Chapter $25$ HW $(10$ points total$)$

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A helium$-$neon laser emits a beam of unpolarized light that passes through three Polaroid filters, as shown in the figure. The intensity of the laser beam is $\backslash (\backslash$mathrm$\{$I$\}\_\{0\}\backslash ).($a$)$ What is the intensity of the beam at point $\backslash ($ A $\backslash )?($b$)$ What is the intensity of the beam at point $\backslash ($ B $\backslash )?($c$)$ What is the intensity of the beam at point $\backslash ($ C $\backslash )?($d$)$ If filter $2$ is removed, what is the intensity of the beam at point $\backslash ($ C $\backslash )?(10$ points$)$