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Reading Glasses (5 Pairs) Reading glasses don’t need to cost an arm and a leg, Dr. Raviv says. For just over $15, you can get five pairs of these beloved readers—which means they clock in at ...
Tcamp Ice Cube Tray for 30-40 oz Tumbler Cup. $13 $24. Save $11 with Prime. If your family only drinks out of Stanleys or Yetis, they'll flip for this tray that makes cylinder-shaped ice to fit ...
6-Pack Plug-in Nightlights. $8 $10. Save $2 with Prime. If your house is too dark at night, help is here. Automatic sensors turn these LED cuties on when there's no more light. They're tiny but ...
GI glasses are eyeglasses issued by the American military to its service members. Dysphemisms for them include the most common " birth control glasses " ( BCGs) and other variants. At one time, they were officially designated as regulation prescription glasses ( RPGs ). [citation needed] This was commonly said to mean "rape prevention glasses ...
A familiar dispersive prism. An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular ...
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]