User:Speddie2/Sandbox
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This is my sandbox
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Apertures.jpg/640px-Apertures.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Aperture_in_Canon_50mm_f1.8_II_lens.jpg/640px-Aperture_in_Canon_50mm_f1.8_II_lens.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/1/1f/ApertureDefn1707.png)
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system
This is my sandbox
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system