The Optical Image

Task 9. Read the text «The Optical Image», fill in the gaps using the words below, and translate it into Russian.

Task 8. Fill in the map below and write the summary of the text.

Task 7. Choose the correct answer.

Task 6. Decide if the statements are true, false or not mentioned in the text.

Task 5. Choose the correct words.

Task 4. Match the words with the similar meaning.

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.

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

1. Optics uses a lot of special devices / branches.

2. Optics is divided / expounded into physical and geometrical one.

3. All types of waves are broadened / governed by a single equation of wave motion.

4. Optics deals with the propagation / resurgence of light.

5. Since 60s of the 20^th century lens design has undergone / investigated great changes.

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.

1. What is optics?

a) the science that deals with the production and propagation of light, the changes it undergoes and produces, and closely related phenomena

b) the science of light and vision

c) the scientific study of light and closely related phenomena

2. What are the branches of optics?

a) physical and geometrical

b) symmetrical and geometrical

c) physical and electromagnetic

3. What was the term «optics» originally used?

a) in relation to eye and vision

b) in relation to any application of light

c) only in relation to eye

4. How was the meaning of the term «optics» broadened later?

a) to cover any application of light

b) to cover physical detectors

c) to cover the ultimate receiver

5. What regions of the electromagnetic radiation spectrum did optical methods come to be applied to?

a) X-rays and microwave radio waves

b) X-rays, ultraviolet, infrared waves, photographic plate

c) X-rays, ultraviolet, infrared, and microwave radio waves

Main idea ______________

Major detail 1 ______________

Major detail 2 ________________

Major detail 3 ______________

An optical image may be regarded as the apparent reproduction of an object by a lens or mirror system, employing light as a _(1)_. An entire _(2)_ is generally produced simultaneously, as by the lens in a camera, but images may also be generated sequentially _ (3)_, as in a television system or in the radio transmission of pictures across long distances in space. Nevertheless, the final _(4)_ of all images is invariably the human eye, and, whatever means is used to transmit and control the light, the final _(5)_ must either be produced simultaneously or scanned so _(6)_ that the observer’s persistence of vision will give him the mental impression of a complete image covering a finite field of view. For this to be effective the image must be repeated (as in motion pictures) or scanned (as in television) at least 40 times a second to eliminate _(7)_ or any appearance of intermittency.

flicker detector point-point scanning

light carrier

rapidly image

Дата добавления: 2015-01-03