Answer:
Explanation:
After World War II, defeated Germany was divided into Soviet, American, British and French zones of occupation. The city of Berlin, though technically part of the Soviet zone, was also split, with the Soviets taking the eastern part of the city. After a massive Allied airlift in June 1948 foiled a Soviet attempt to blockade West Berlin, the eastern section was drawn even more tightly into the Soviet fold. Over the next 12 years, cut off from its western counterpart and basically reduced to a Soviet satellite, East Germany saw between 2.5 million and 3 million of its citizens head to West Germany in search of better opportunities. By 1961, some 1,000 East Germans—including many skilled laborers, professionals and intellectuals—were leaving every day
In August, Walter Ulbricht, the Communist leader of East Germany, got the go-ahead from Soviet Premier Nikita Khrushchev to begin the sealing off of all access between East and West Berlin. Soldiers began the work over the night of August 12-13, laying more than 100 miles of barbed wire slightly inside the East Berlin border. The wire was soon replaced by a six-foot-high, 96-mile-long wall of concrete blocks, complete with guard towers, machine gun posts and searchlights. East German officers known as Volkspolizei (“Volpos”) patrolled the Berlin Wall day and night.
Poland, and parts of Belgium and the Netherlands. They were spared as the result of quarantined their borders and isolated themselves.
A lens is considered a <u>convex </u>lens when its diameter is much greater than its thickness.
Convex lenses are used in eyeglasses for correcting farsightedness, wherein the gap among the attention's lens and retina is too short, because of which the point of interest lies at the back of the retina. Eyeglasses with convex lenses increase refraction, and as a consequence reduce the focal length.
A concave lens is thinner in the middle and thicker at the edges. A convex lens is thicker within the middle and thinner at the rims. additionally known as. it's also referred to as Diverging Lens. it's also referred to as Converging Lens.
An optical lens is normally made from two round surfaces. If those surfaces are bent outwards, the lens is called a biconvex lens or actually a convex lens. these kinds of lenses can converge a beam of light coming from out of doors and attention it to a point on the other side.
Learn more about Convex lenses here: brainly.com/question/12323990
#SPJ4
