Тест по теме: «Дифракция света»
1. Какое из приведенных ниже выражений определяет понятие дифракция?
А. Наложение когерентных волн
Б. Разложение света в спектр при преломлении
В. Огибание волной препятствия

2. Какое из наблюдаемых явлений объясняется дифракцией?
А.Излучение света лампой накаливания
Б. Радужная окраска компакт-дисков
В. Получение изображения на киноэкране

3. Какое из наблюдаемых явлений объясняется дифракцией?
А. Радужная окраска тонких мыльных пленок
Б. Появление светлого пятна в центре тени от малого непрозрачного диска
В. Отклонение световых лучей в область геометрической тени

4. Какое условие является необходимым для наблюдения дифракционной картины?
А. Размеры препятствия много больше длины волны
Б. Размеры препятствия сравнимы с длиной волны
В. Размеры препятствия много больше амплитуды волны

5. Свет какого цвета располагается дальше всего от центра дифракционной картины?
А. Красного
Б. Зеленого
В.Фиолетового
6. Дифракционная решетка имеет 50 штрихов на миллиметр. Под каким углом виден
максимум второго порядка для света с длиной волны 400 нм?

Great Britain is the name of the largest island of the British Isles and it ts made up of England, Scotland and Wales. Geographically, the island of Great Britain is subdivided into two main regions — Lowland Britain and Highland Britain. Lowland Britain comprises southern and eastern England. Highland Britain consists of Scotland, most of Wales, tho Pennines. The chief rivers of Great Britain are: the Severn, the Avon, the Thames and some others. The Highlands of Scotland are among the oldest mountains in the world. Most of the population of Scotland is concentrated in the Lowlands.  ts Glasgow. Scotland's biggest city. Wales is a highland country of old, hard rocks. North Wales is a country of mountains and deep valleys. South Wales is a land of high hills and wide valleys. 

1. - Would you like tea or coffee? – No, thanks, I have just (had) dinner. I’m not hungry.
2. - Have you (mailed) the letter?
3. - Did you (finish) your work yesterday? – Yes, we (managed) a lot.
4. - Has your friend (seen) John lately? – Yes, he … (saw) him not long ago. He … (looked) excited.
5. Where have you … (been) all this morning? It’s nearly midday now.
6. He … (went) to Africa about a month ago. Yesterday I … (got) a letter from him.
7. Where were you this morning? I called you several times before noon.
8. She’s a great traveler: she has (visited) almost 30 countries.
9. I once … (met) an old man called Jack Peterson.
10. Who … (discovered) America?
11. Do you know that Miranda … (has given) birth to a girl?
12. Lots of things … (have happened) recently: Robert … (has got) married. He … (married) Linda from Main Street a fortnight ago.
13. I have already … (done) a lot in my life: I … (have written) 7 books and numerous articles, I … (have planted) a garden. I also … (travelled) to Italy and Greece a year ago where I … (met) very many interesting people.
14. Last month I … (flew) to a friend of mine in Los Angeles. He … (was) delighted to see me.
15. Has Barbara … (phoned) you yet? Has she … (come) back home yet?
16. When did it (rain) here last time? It has (not rained) here for ages.
17. Tchaikovsky … (composed) so many wonderful ballets and operas. Have you ever (listened) to his famous “Iolanta”?