Wonders of the Universe. Andrew Cohen

Чтение книги онлайн.

СКАЧАТЬ forty degrees to this line, you’ll see the Descartes’ ray of blue light, and all the colours of the rainbow in between. There is some light reflected back to your eye through shallower angles, which is why the sky is brighter below the arc than above it. You don’t see the colours below the arc because all the rays merge to form white light. On the picture on the previous page, you can see the sky brightening inside the rainbow over the Victoria Falls, and the relative darkness of the sky outside it.

      So raindrops separate the white sunlight into a rainbow because each of the constituent colours gets reflected back to your eye at a slightly different maximum angle. But why the arc? In fact, rainbows are circular. Think of the imaginary line again between the Sun, your head and the ground. There isn’t just one place at which the angle between this line and the sky is forty-two degrees, there is a whole circle of points surrounding the line. The reason you can’t see a complete circle is that the horizon cuts it off, so you only see the arc. This is also why you tend to see rainbows in the early morning or late afternoon. As the Sun climbs in the sky, the line between the Sun and your head steepens and the rainbow, which is centred on this line, drops closer and closer to the horizon until at some point it will vanish below the horizon.

      Конец ознакомительного фрагмента.

      Текст предоставлен ООО «ЛитРес».

      Прочитайте эту книгу целиком, купив полную легальную версию на ЛитРес.

      Безопасно оплатить книгу можно банковской картой Visa, MasterCard, Maestro, со счета мобильного телефона, с платежного терминала, в салоне МТС или Связной, через PayPal, WebMoney, Яндекс.Деньги, QIWI Кошелек, бонусными картами или другим удобным Вам способом.

/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAZAAA/+4ADkFkb2JlAGTAAAAAAf/b AIQAAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQICAgICAgICAgIC AwMDAwMDAwMDAwEBAQEBAQECAQECAgIBAgIDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMD AwMDAwMDAwMDAwMDAwMDAwMD/8AAEQgDIAJYAwERAAIRAQMRAf/EAOQAAAICAwEBAQEBAAAAAAAA AAYHBQgECQoDAgEACwEAAgMAAwEBAQAAAAAAAAAABQYDBAcAAggBCQoQAAEDAwMCBQIEAwYEAwQA FwECAwQRBQYAEgchEzFBIhQIUQlhMiMVcYFCkVIzJBYKobFiF8FyQ/DRNCUY4YJTYyYZ8ZKic1RF NkYa0mR1Zic3RxEAAQMCBAMEBwYEBAMGAwATARECAwAEITESBUFRBmFxIhOBkaHBMhQH8LHR4UIj UmIzFfFyJAiCQxaSssLSUzSiJRfiY3ODs1TTRDUmCZNkGKPDdDYn/9oADAMBAAIRAxEAPwDngmcS YFyfwJL+dGM4TEtXJcDJp0nJvjxixdctFwdjS0xU8uY3hbLRdt/DUaStD01RolM3tpALBW8nH7Pe txj3yTpu5e07dBEyRj3MRHuQhmvLUAUcwKmIU1uHyR3S

СКАЧАТЬ