![]() Reflective prisms use total internal reflection to achieve near-perfect reflection of light that strikes the facets at a sufficiently oblique angle. They are typically used to erect the image in binoculars or single-lens reflex cameras – without the prisms the image would be upside down for the user. Reflective prisms are used to reflect light, in order to flip, invert, rotate, deviate or displace the light beam. Spectral dispersion is the best known property of optical prisms, although not the most frequent purpose of using optical prisms in practice. Grism, a dispersive prism with a diffraction grating on its surface.Littrow prism with mirror on its rear facet. ![]()
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