Учебно-методическое пособие по чтению специальной литературы для студентов 1 курса физического факультета. Дроздова И.В - 13 стр.

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3. Look through the opening paragraph of the text to check up the wording.
Reading
4. Choose the synonym. Use the dictionary in case you need it. Find in the text the
sentences where the underlined words are used. Translate them.
1. aberration, n. 4. faulty, adj. 7. startling, adj.
A. observation A. imperfect A. releasing
B. distortion B. impossible B. immediate
C. defect C. spherical C. shocking
D. consideration D. exact D. attacking
2. nuisance, n 5. distinguished, adj. 8. thorough, adj.
A. trouble A. unknown A. immense
B. achievement B. genuine B. sophisticated
C. invention C. famous C. complete
D. lens D. distinct D. significant
3. blurred, adj. 6. unaware, adj. 9. fringe, n.
A. dirty A. untrue A. edge
B. broken B. impossible B. frame
C. curved C. inaccurate C. image
D. sharp D. not knowing D. particle
5. Read paragraphs 2-3 to find out what spherical aberration is. Write down one
concise sentence about it.
6. Read paragraph 4-7 to distinguish between refracting and reflecting principles.
Note down your ideas.
7. Read paragraph 8-13 to trace the construction and development of the reflecting
telescopes. Take down the main steps.
8. Sum up the text in thirteen sentences.
Newton and the Reflecting Telescope
1. A telescope is based generally upon the following principle: an image of some
distant object is formed by a lens called the object lens and this same image
is, in turn, observed by means of another lens called the eyepiece. However,
if the telescope is to be any good at all, the object lens must be able to collect
the light rays from points of the observed object and focus them accurately. If
the rays from any given point of the object do not give an exact point image,
then the telescope suffers from optical confusion, or aberration.