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optics - What determines if light rays will be parallel to each other after refraction through a lens? - Physics Stack Exchange
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Amazon.com : Telescope 130EQ Astronomical Reflector Telescope - Manual Equatorial Telescope for Adults Astronomy. Comes with 2X Barlow Lens Phone Adapter and Moon Filter & Sun Fliter, Wireless Control : Electronics
![An optic to replace space and its application towards ultra-thin imaging systems | Nature Communications An optic to replace space and its application towards ultra-thin imaging systems | Nature Communications](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41467-021-23358-8/MediaObjects/41467_2021_23358_Fig1_HTML.png)
An optic to replace space and its application towards ultra-thin imaging systems | Nature Communications
![Amazon.com : Telescope 130EQ Astronomical Reflector Telescope - Manual Equatorial Telescope for Adults Astronomy. Comes with 2X Barlow Lens Phone Adapter and Moon Filter & Sun Fliter, Wireless Control : Electronics Amazon.com : Telescope 130EQ Astronomical Reflector Telescope - Manual Equatorial Telescope for Adults Astronomy. Comes with 2X Barlow Lens Phone Adapter and Moon Filter & Sun Fliter, Wireless Control : Electronics](https://m.media-amazon.com/images/I/411Rg-pEJGL._AC_SY350_.jpg)