Question: = Derive the ray intersection pattern for a system suffering from spherical aberration (W404) and defocus (W202). Consider the following cases: (a) W202 W40,

= Derive the ray intersection pattern for a system suffering from spherical 

= Derive the ray intersection pattern for a system suffering from spherical aberration (W404) and defocus (W202). Consider the following cases: (a) W202 W40, (b) W20W40 (c) W202 W40, (d) W20 = 0. In all cases, plot the size of the intersection pattern as a function of r, wherer varies from 0 to 1, and thus justify why case (c) is the best geometrical focus.

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