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  Indian J Med Microbiol
 

Figure 1: Light path through a 15Δ prism. The amount of deflection (in cm) of a light ray that is caused by a prism, measured 1 m (100 cm) away from the prism, is equal to the power of the prism in prism diopters (Δ). Thus, a 15Δ prism, as in this illustration, deviates a light ray 15 cm toward the base of the prism, when measured 1 m away from it

Figure 1: Light path through a 15<sup>Δ</sup> prism. The amount of deflection (in cm) of a light ray that is caused by a prism, measured 1 m (100 cm) away from the prism, is equal to the power of the prism in prism diopters (<sup>Δ</sup>). Thus, a 15<sup>Δ</sup> prism, as in this illustration, deviates a light ray 15 cm toward the base of the prism, when measured 1 m away from it