Laser Safety

Because the eye focuses laser light as it does other light, the chief danger in working with lasers is eye damage. Therefore, laser light should not be viewed, whether it is direct or reflected. Lasers should be used only by trained personnel wearing protective goggles.

Check your understanding

Exercise 1. Read the text and answer the questions.

1. Why are lasers ideal for space communication?

2. What is the use of lasers restricted by?

3. Why are lasers used in so many fields of our life?

4. Why should lasers be used only by trained personnel wearing protective goggles?

5. In what sphere to your mind have lasers found the widest application and why?

Exercise 2. Find the suitable endings of the following sentences.

1. Lasers have become valuable tools in…

2. Powerful laser beam can be focused on…

3. Lasers are also the most effective detectors of…

4. Laser techniques have also been used for…

5. Lasers have been used to…

6. Laser techniques have also been developed for…

1. industry, scientific research, communication, medicine, military technologies and arts.

2. a small spot with enormous power density.

3. certain types of air pollution.

4. high-density information recording.

5. “weld” the retina, bore holes in the skull, vaporize lesions and cauterize blood vessels.

6. lab tests of small biological samples.

Exercise 3. Translate the passage “Military Technology” and discuss the topic

“What do you think about missile defense systems situation in Russia and the USA?”

Increase your vocabulary

Exercise 1. Read English words and collocations and find Russian equivalents to them.

1	2
exposure time	импульс
frequency shift	система защиты
speed of light	ядерное плавление
laser light	свет лазера
intensity	вред
tunable dye laser	структура молекулы
damage	лазерный луч
defense system	защита
nuclear weapon	скорость света
pulse	интенсивность
molecular structure	перестраиваемый лазер на красителе
	сдвиг по частоте
	время экспонирования

Exercise 2. Translate the following word combinations with Participle II as an attribute.

Focused beams, powerful short pulse produced by, very fast laser-activated switches, small frequency shifts caused by, in the defense system urged by, trained personnel.

Language activity

Exercise 1. Summarize your knowledge of the types of Subordinate Clauses.

Form one sentence out of two using conjunctions given in brackets and translate it.

1. I don’t remember the day. They left for London. (when)

2. We went across the fields. There stood Anne’s cottage. (where)

3. I asked him. He wanted of me. (what)

4. I thought. He was a good actor. (that)

5. He managed to get such books. He did not tell me about it. (how)

6. I couldn’t come to see you. I was unwell. (because)

7. Wait for me a little. You are not in a hurry. (if)

8. I met them. They arrived from London. (as soon as)

9. I leave Stratford. I’ll let you know. (before)

10. The reason is not clear. Many students were absent at the lecture. (why)

Exercise 2. Translate the sentences into English using conjunctions “which”, “when”, “if”, “as”, “where”, “that”, “till”.

1. Школа, в которой (где) я учился, находится в центре города.

2. Вот книга, которую вы хотели прочитать.

3. Преподаватель сказал, что я должен много работать над английским произношением.

4. Когда мы вернулись, было уже темно.

5. Я буду ждать до тех пор, пока вы не позвоните.

6. Мы не могли вас навестить, так как только вчера прибыли из Лондона.

7. Если дождь не прекратится, мы не пойдем гулять.