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15. Translate the following sentences into English.

1. Необхідно, щоб ви прочитали інструкцію перед експлуатацією цього приладу.

2. Якби він вивчив нові слова напам'ять, він зміг би використовувати їх у своїх реченнях під час тесту.

3. Вона просила щоб він полагодив комп'ютер.

4. Важливо, щоб ці нові факти було прийнято до уваги.

5. Я пропоную, щоб збори було відкладено.

6. Що б не сталося, я завжди буду вашим вірним другом.

7. Йому не довелося б лагодити цей прилад, якби він заздалегідь прочитав інструкцію.

8. Якби вона говорила по-англійськи, вона могла б отримати гарну роботу в агентстві подорожей.

16. Your teacher asked you to write an essay about the laser. Write an essay to the plan below:

- different types of lasers;

- the importance of laser;

- wide-ranging technological uses.

Write an essay of at least 160 words using the words and word combinationa:

types of lasers, emission of radiation, light waves, purity, size, concentration, shape, laser installations, applications of lasers

17. Read the supplementary text and entitle it. Translate the text into Ukrainian and put 15 different questions.

Many scientific, military, medical and commercial laser applications have been developed since the invention of the laser in the 1958. The coherency, high monochromaticity, and ability to reach extremely high powers are all properties which allow for these specialized applications.

In science, lasers are used in many ways, including: spectroscopy, atmospheric remote sensing, holographic techniques . Laser based LIght Detection And Ranging (LIDAR) technology has application in geology, seismology, remote sensing and atmospheric physics. Lasers have been used aboard spacecraft such as in the Cassini-Huygens mission. In astronomy, lasers have been used to create artificial laser guide stars, used as reference objects for adaptive optics telescopes.

Most types of laser are an inherently pure source of light; they emit near-monochromatic light with a very well defined range of wavelengths. By careful design of the laser components, the purity of the laser light (measured as the "linewidth") can be improved more than the purity of any other light source. This makes the laser a very useful source for spectroscopy. The high intensity of light that can be achieved in a small, well collimated beam can also be used to induce a nonlinear optical effect in a sample, which makes techniques such as Raman spectroscopy possible.

Industrial laser applications can be divided into two categories depending on the power of the laser: material processing and micro-material processing.

The laser has in most firearms applications been used as a tool to enhance the targeting of other weapon systems.

Laser medicine is the use of various types of lasers in medical diagnosis, treatment, or therapy.

In consumer electronics, telecommunications, and data communications, lasers are used as the transmitters in optical communications over optical fiber and free space.