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Uses an equiconvex crown glass lens (i.e. R 1 > 0 with −R 1 = R 2) and a complementary-curved second flint glass lens (with R 3 = R 2). The back of the flint glass lens is flat ( R 4 = ∞). A Littrow doublet can produce a ghost image between R 2 and R 3 because the lens surfaces of the two lenses have the same radii.
The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. [a] The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president, Donald Trump, and vice president, Mike Pence. [9]
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Microsoft Bing, commonly referred to as Bing, is a search engine owned and operated by Microsoft.The service traces its roots back to Microsoft's earlier search engines, including MSN Search, Windows Live Search, and Live Search.
[117] [118] Harris has opposed Trump's proposed 20% tax on imports. [119] The New York Times described Harris's economic policy as embracing "the idea that the federal government must act aggressively to foster competition and correct distortions in private markets." Harris has proposed raising taxes on corporations and high-earners to fund ...
They wanted to round up people to buy the same product in order to receive a group discount. Founder Eric Lefkofsky wanted the company to pivot in order to focus entirely on group buying. Born from The Point, Groupon was launched in November 2008. [15] [16] [17] The name for the e-commerce platform, Groupon is a portmanteau of "group" and ...
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