$2.$ A source emits light that is vertically polarized, and some of this light strikes a polaroid a distance L$.$ from the source, while the remainder of the light goes past the polaroid without passing through it$.$ The intensity of the light that passes through the polaroid is measured by detector #$1$ immediately after it passes through the polaroid. The intensity of the light that misses the polaroid is measured by detector #$2$ at a distance $2$L from the source. To what angle must the polaroid be rotated relative to the vertical polarization direction for the two measured intensities to be equal? Assume that the light spreads spherically as it travels. a$.0$ b$.30$ c$.45$ d$.60$ e$.$ none of