Consider a toric lens whose two surfaces are spherical and toroidal. The spherical side has a power of +4:0 D, while the toroidal side is described by +6:0 90= + 2:0 180. (a) Determine the power cross. (b) Find the Sturm interval for a point object at 20 cm from the lens.

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Consider a toric lens whose two surfaces are spherical and toroidal. The spherical side has a power of +4:0 D, while the toroidal side is described by +6:0 90= + 2:0 180. (a) Determine the power cross. (b) Find the Sturm interval for a point object at 20 cm from the lens.

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