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Consider a topic lens whose two surfaces are spherical and toroidal. The spherical side has a...

Consider a topic lens whose two surfaces are spherical and toroidal. The spherical side has a power of +4.0D, while the toroidal side is described by +6.0 x 90/ +2.0x180

a)determine the power cross

b)find the sturm interval for a point object at 20 cm from the lens

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