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Kids ages 2-5, with an adult, are invited to join for stories, songs, rhymes and more. Little Learners Playgroup at the Central Library, 11 a.m. Fridays, Feb. 2, 9, 16 and 23. Kids up to age 5 ...
Without further ado, here’s a list of the very best Christmas crafts for adults, including sewing projects, DIY decor, heirloom advent calendars and more. 31 Christmas Crafts for Toddlers That ...
CEO Wendell Weeks talks about Corning Inc.’s innovations—ranging from Edison’s lightbulb to the face of your smartphone—and how its fiber-optic cables are powering the AI revolution.
Optical glass refers to a quality of glass suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors.Unlike window glass or crystal, whose formula is adapted to the desired aesthetic effect, optical glass contains additives designed to modify certain optical or mechanical properties of the glass: refractive index, dispersion, transmittance, thermal expansion and ...
Photosensitive glass vase. Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. [1] Photosensitive glass was first discovered by S. Donald Stookey in 1937. [2] [3] [4]
Low-dispersion glass (LD glass) is a type of glass with reduced chromatic aberration, meaning the refractive index does not change as strongly with different wavelengths of light. In other words, the light passing through the glass has a smaller spread or dispersion between its constituent colors, resulting in a reduced " rainbow effect" at ...
If the highest Abbe number is desired, the only choices for common lens optical material are optical crown glass and CR-39. Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown ...
Optical toys form a group of devices with some entertainment value combined with a scientific, optical nature. Many of these were also known as " philosophical toys " when they were developed in the 19th century.