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Unlike mirrors, retroreflective surfaces reflect light back toward the source. Hot finding is less of a problem with retroreflective high gain screens. Unfortunately, at the perpendicular instructions used for gain measurement, mirror reflection and retroreflection are equivalent, and this has actually planted confusion about the behavior of high gain screens. A second common confusion about screen gain occurs for grey colored screens.

Nevertheless, the grey screen can have determined gain of 1 and even much greater than 1. The geometric behavior of a grey screen is different from that of a white screen of identical gain. Therefore, since geometry is essential in screen applications, screen materials must be at least defined by their gain and their overall reflectance.

Curved screens can be made extremely reflective without introducing any visible locations, if the curvature of the screen, positioning of the projector and the seating arrangement are designed correctly. The object of this design is to have the screen reflect the predicted light back to the audience, efficiently making the whole screen a giant "hot spot".

Semi-specular high gain screen materials are fit to ceiling-mounted projector setups given that the best intensity of light will be reflected downward towards the audience at an angle equivalent and opposite to the angle of occurrence. However, for an audience seated to one side of the audience the opposite side of the screen is much darkened for the same reason.

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Glass-bead screens display a phenomenon of retroreflection; the light is shown more intensely back to its source than in any other direction. They work best for setups where the image source is placed in the very same instructions from the screen as the audience. With  movie theatres , the screen center may be brighter than the screen periphery, a sort of hot identifying.

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Retroreflective screens are seen as preferable due to the high image intensity they can produce with an offered luminous flux from a projector. Screen geometry [edit] Square-shaped screens used for overhead projectors sometimes function as projection screens for digital projectors in conference room, where space is scarce and numerous screens can appear redundant.