| http://www.w3.org/ns/prov#value | - n accordance with the invention, however, some crystals (most of which may be birefringent) e.g., uniaxial crystals like rutile (TiO2), and an isotropic crystal like strontium titanate etc. may be used in combination with conventional optical glasses to meet the required condition. [0035] If the angle of incidence ?? is held constant, optical devices such as etalons, light guides and virtual-image
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