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4. Complete the dialogue.

- We are going to ..., aren't we?

- ... .But first, I'd like you ... questions. To begin with,...?

- The word 'laser' ...

-OK. Then...?

- A very powerful ...

-The first they?

- No, you are ... . They appeared about... ago.

- And ... many uses?

- Without any doubts. ...

- I also would like you ...

- Oh, that is easy .... is in the basis of laser operation.

- I see. Why are lasers considered ...?

- …

- That's pretty scary.

- …

- Fine.

5. Match a line in a with a line in b.

А В

1. Are lasers amplifiers or a) It is a device for increasing the

oscillators? strength of a signal.

2. What is an oscillator? b) Welding, cutting, holography.

3. What is an amplifier? c) It is a generator or source of

4. What makes lasers light.

dangerous? . d) Oscillators.

5. What are lasers used for? e) When treated inadequately.

6. When does the laser become f) Their producing an extremely

a source of destruction? powerful beam of light.

6.Match the words with the similar meaning.

synthetic feature

exactly powerful

characteristic usage

application to offer

to suggest to possess

single artificial

strong precisely

to have separate

7. Find in the list these parts of speech.

(noun) amplify, weak, absorption, to treat

(noun) partially, excited, bounce, pulse

(adjective) activate, solution, flat, principle

(adjective) tiny, purify, majority, totally

(adverb) intense, forth, numerous, since

(adverb) powerful, infrared, exactly, cavity

(preposition) input, actually, via, ultraviolet

(verb) radiation, synthetic, reflective, manipulate

(verb) emit, unique, oscillator, quality

8. To make a hologram is rather difficult. Making a hologram is rather difficult.

1. To produce a powerful beam of light is possible with the help of a

laser.

2. To recognize a problem is the first step to its solution.

3. To establish relationship between naturtal phenomena is a major

task of his theory.

4. To introduce the invention into practice sometimes requires more

effort than making it.

5. To point out the mistakes to some people proves quite difficult.

6. To analyze the evidence correctly requires a lot of attention.

9. Restore the original sentences.

1. without being helped, the laser, won't succeed, in testing, he

2. a laser, in making, should use, you, a hologram

3. man, having invented, is capable of, the laser, light shows,

successfully, producing

4. became possible, after the appearance, making holograms, in

the 1960s, of a laser

5. all his knowledge and experience, applied, this work, doing, he

6. will provide, applying, another solution, the new device, to the

problem

10. Translate the sentences into English using your active vocabulary.

1. Маючи різні рівні енергії, електрони нижніх рівнів можуть переходити на вищі шляхом поглинання світла або тепла.

2. Без використання лазера голограма неможлива.

3. Використовуючи новий метод, вони змінили спектр світла.

4. Здобуття потужного променя можливе лише за допомогою лазера.

5. Проводячи експерименти з лазером, професор пояснював студентам принцип його роботи. 6. Виконання цієї роботи вимагає досвіду.

7. Облік окремих компонентів змінить всю систему.

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