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  2. Corrective Optics Space Telescope Axial Replacement

    en.wikipedia.org/wiki/Corrective_Optics_Space...

    Since it was too difficult to bring the HST back to earth for repairs the engineers considered everything from replacing the telescope's secondary mirror by sending a spacewalking astronaut into the telescope's optical tube, to installing a circular shade around the opening of the tube, which would reduce the aperture and improving the focus by ...

  3. Foucault knife-edge test - Wikipedia

    en.wikipedia.org/wiki/Foucault_knife-edge_test

    Viewing the mirror from behind the knife edge shows a pattern on the mirror surface. If the mirror surface is part of a perfect sphere, the mirror appears evenly lighted across the entire surface. If the mirror is spherical but with defects such as bumps or depressions, the defects appear greatly magnified in height.

  4. Mirror - Wikipedia

    en.wikipedia.org/wiki/Mirror

    A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...

  5. More McFlurrys: US Copyright Office allows McDonald's to fix ...

    www.aol.com/more-mcflurrys-us-copyright-office...

    A broken ice cream machine is a familiar inconvenience to McDonald's customers.. Franchise owners have complained about difficulties fixing the machines, McDonald's itself has poked fun at how ...

  6. Silvering - Wikipedia

    en.wikipedia.org/wiki/Silvering

    The reflective layer on a second surface mirror such as a household mirror is often actual silver. A modern "wet" process for silver coating treats the glass with tin(II) chloride to improve the bonding between silver and glass. An activator is applied after the silver has been deposited to harden the tin and silver coatings.

  7. “Doctor Was Surprised I Was Alive”: 30 Incredibly Lucky ...

    www.aol.com/50-folks-nearly-died-share-070220868...

    I lived with a broken neck for nearly a year. Going too fast over a speedbump could've k*lled me, but I kept playing football and even scored 5 goals with my head during that time. Was only found ...

  8. Mirror matter - Wikipedia

    en.wikipedia.org/wiki/Mirror_matter

    Mirror matter could also be responsible for the GZK puzzle [broken anchor]. Topological defects in the mirror sector could produce mirror neutrinos which can oscillate to ordinary neutrinos. [30] Another possible way to evade the GZK bound is via neutron–mirror neutron oscillations. [31] [32] [33] [34]

  9. 3 children abducted from Virginia found 600 miles away in ...

    www.aol.com/amber-alert-issued-3-children...

    The children were waiting for a school bus outside an apartment complex when they were seized in Fishersville. They were later tracked down to Alabama.

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