Fig. 5
Deviation angle δφ in an oblique section of the reconstructed round wedge prism. A light ray enters the prism at an incident angle iφ from above parallel to the Z axis, which corresponds to the rotation axis of the original round wedge prism. The refracted light is emitted from the prism at an emergent angle eφ, with deviation angle δφ with respect to the incident light. The light is deviated by PDφ cm at a distance of 100 cm. The prism diopter PDφ represents the prismatic power in an oblique section and is determined as \(\:{\text{P}\text{D}}_{\phi\:}=100\text{tan}{\delta\:}_{\phi\:}\). αφ, apex angle of the prism in an oblique section of angle φ; n0, n1, and n2, refractive indices of the medium in front of the prism, in the prism, and behind the prism, respectively. The drawings do not represent the real lengths. (a) \(\:0\le\:\phi\:<\frac{\pi\:}{2}\) and \(\:\frac{3\pi\:}{2}\le\:\phi\:<2\pi\:\). (b) \(\:\frac{\pi\:}{2}\le\:\phi\:<\frac{3\pi\:}{2}\).
