Figure 1 | Scientific Reports

Figure 1

From: Wave optics of imaging with contact ball lenses

Figure 1

Experimental measurements and imaging regimes. (a) Schematic of the experimental imaging through a ball lens using a cellphone. (b) Scanning electron microscopy (SEM) image of a Siemens star and its cellphone camera images through the ball (LASFN35 glass, \(R=1\) mm) using optical filters at the specified wavelengths. (c) Geometrical optics of imaging with a ball lens for an object at the surface. A virtual image is created for \(n_r<2\) and a real image for \(n_r>2\). The black arrows indicate the displacement of the image as \(n_r\rightarrow 2\).

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