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| Glass telescope lens inside a glass patio door |
When examining common window glass on a sliding patio door, a nano bubble was discovered. It was unusual that this bubble was not air filled but rather glass filled with a spherical fine natural figure. At longer focal lengths, spherical surfaces function well for forming telescopic images. Macro inspection yielded functions of a telescope with imagery focusing on distant objects, seeing far-away mountains and skyscrapers. It's highly unusual to find a telescope lens inside window glass!
