Building a multifocal lens
Multifocal lens with greater lens power in its central element.
Image formation by a distant object.
Image formation by a near object with an unchanged image distance.
Object arrow followed by its two inverted real images. With a single image distance, the multi-focal lens in Fig. 1 is capable of forming two distinct images with very different sizes when the object is placed far from and near to the lens.
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