Task 1. Discuss with a partner. 1. Do you agree or disagree with the quotation above?
1. Do you agree or disagree with the quotation above?
2. What does optics study?
Task 2. Skim the text and choose the best title of it.
a) Two branches of optics
b) The history of the development of optics
c) The general considerations of optics
______________________
Optics is the science concerned with the genesis and propagation of light, the changes that it undergoes and produces, and other phenomena closely associated with it.
There are two major branches of optics, physical and geometrical. Physical optics deals primarily with the nature and properties of light itself. Geometrical optics has to do with the principles that govern the image-forming properties of lenses, mirrors, and other devices that make use of light. It also includes optical data processing, which involves the manipulation of the information content of an image formed by coherent optical systems.
Originally, the term «optics» was used only in relation to the eye and vision. Later, as lenses and other devices for aiding vision began to be developed, these were naturally called optical instruments, and the meaning of the term «optics» eventually became broadened to cover any application of light, even though the ultimate receiver is not the eye but a physical detector, such as a photographic plate or a television camera.
In the 20th century optical methods came to be applied extensively to regions of the electromagnetic radiation spectrum not visible to the eye, such as X-rays, ultraviolet, infrared, and microwave radio waves, and to this extent these regions are now often included in the general field of optics.
(From Britannica Online Encyclopedia)
Task 3. Read the text again and find the English equivalents for the following words.
Изображение, распространение, видимый, свойство формирования изображения, по отношению к, длина, применение, количество информации, погрешность изображения, фотопластина, оптические методы, геометрическая оптика, переносить.
Task 4. Match the words with the similar meaning.
| 1. genesis (N) 2. device (N) 3. govern (V) 4. involve (V) 5. broaden (V) 6. expound (V) 7. reconstruction (N) 8. branch (N) | a) appliance b) field c) explain d) extend e) control f) origin g) resurgence h) include |
Task 5. Choose the correct words.
1. Optics uses a lot of specialdevices / branches.
2. Optics isdivided / expoundedinto physical and geometrical one.
3. All types of waves arebroadened / governedby a single equation of wave motion.
4. Optics deals with the propagation / resurgence of light.
5. Since 60s of the 20th century lens design has undergone / investigated great changes.
Task 6. Decide if the statements are true, false or not mentioned in the text.
1. The science of optics considers the phenomena closely related with light production.
2. The term «optics» refers only to eye and vision.
3. C.F. Gauss wrote his famous book on physical optics.
4. Geometrical optics also involves optical data processing.
5. Optical methods are applied to the wave and quantum nature of light.