A plus spherical lens is often represented by two prisms base to base. A prism will redirect an image but not refocus it, while a spherical lens will refocus it. When looking through, say, only the bottom portion of a spherical lens (the area below the optial center), it seems that you would be looking through essentially a base up prism. Yet the image still gets "corrected" while looking through a simple base up prism, the image is not corrected. What am I missing? Can spherical lenses really be thought of as prism combinations? Thanks for any insight on this.
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