Question

Unpolarized light of intensity $32W{m}^{-2}$ passes through three polarizes such that the transmission axis of the last polarizers is crossed with that of the first. The intensity of final emerging light is $3W{m}^{-2}$.The intensity of light transmitted by the first polarizered will be

• A. $32W{m}^{-2}$
• B. $16W{m}^{-2}$
• C. $8W{m}^{-2}$
• D. $4W{m}^{-2}$

Answer 1

Answer: (B)

$16W{m}^{-2}$

initial unpolarized intensity is $32W{m}^{-2}$
the intensity of light transmitted by the first polarizered will be $\frac{I_{unpolarized}}{2}=16W{m}^{-2}$