I. Answer the questions:

1. What can one use for separating the ordinary and the extraordinary rays from each other? 2. What is a Nicol prism? 3. Into how many parts must a rhombus of Iceland spar be cut to make a Nicol? 4. What are the cut surfaces cemented with? 5. What does the difference in the refractive indices of Balsam and Iceland spar amount to? 6. Is the refractive index of Iceland spar the same for both the ordinary and the extraordinary ray? 7. What takes place when the beam enters the face of the rhombus and is split into two rays? 8. What is the surface of the rhombus usually coated with? 9. What is it customary to coat the surface of such a rhombus with? 10. What is it done for? 11. Why cannot total reflection occur in this case? 12. What do we mean by plane polarized light? 13. What is the intensity of such a plane polarized beam? 14. What happens to the rest of the incident beam? 15. Is there but one kind of Nicol prism or are there any modifications of it? 16. What are these modifications designed for? 17. Do these modifications have no advantages? 18. What is the percentage of light these prisms can usually transmit? 19, How much light are these prisms known to transmit? 20. Is it never desirable to use both rays with the polarizing prism used to separate them? 21. What can be done for this purpose? 22. What can be done to obtain this effect? 23. Are there any films available for the production of polarized light? 24. Are there any films available for obtaining polarized light as a rule, as effective as Nicols? 25. What is their main disadvantage? 26. Do those films have any advantages as well?

INTERFERENCE

II. Give Russian equivalents:

to enable	a wave motion			to remove		a spatial image
to avoid	a period of vibration			to result		a modern branch
to incline	an original experiment			to substitute		an obtuse angle
to devise	an opposite direction			to consider		alternate bands
to design	a narrow transmission band			to travel		laser beams
to coincide		to reinforce	optical parts		to observe		dark fringes
to establish	a simple modification			to reach		bright bands

III.

a) Give Russian equivalents:

1. in the same direction, 2. to be placed in front of (behind of), 3. to be equally illuminated, 4. to observe a series of bands, 5. light passes through holes, 6. to consider in detail, 7. to cover the distance, 8. to travel the distance, 9. to be equal to an odd number (even number), 10. to produce displacement of the ray of light.

b) Give English equivalents:

1. тупой угол, 2. половина длины волны, 3. электронно-оптический дальномер, 4. объемное изображение, 5. яркое пятно, 6. чередующиеся полосы, 7. выбранная точка, 8. освещенный экран, 9. равноудаленные полосы, 10. современные методы.

IV. Remember the following groups of words:

Light produces an illumination; light waves are in phase; light reaches the screen; light comes from a source of light; light waves may neutralize each other; light waves coincide and therefore reinforce each other; light travels the distance; light is allowed to pass through.

V. Use the suffix -ment and form new nouns from the following words; translate them:

To develop, to achieve, to equip, to move, to arrange, to treat, to state, to establish, to announce, to advertise.

VI. Name the suffixes in the following words, translate them:

Solidity, solidify, soundless, spacious, speaker, observer, physics, dynamics, mathematics, mechanics, phonetics, kinematics, inventive, inventor, solvable, solvability, solidarity, perpendicularly, polarization, polarize, polarizing.

VII. Tell what parts of speech the following words belong to; translate them:

Impersonal, impersonality, implantation, exploration, exploitative, exploratory, exploiter, heartless, extractive, extraction, extractor, figurative, reddish, fighter, understandable, imperfection, pitiless, limitless, classless, successful, relaxation, imperishable, meaningful, hopeless, demonstration, demonstrative, boxer, boxing, branchless, particularly, connection, spontaneous, spontaneity.

VIII. Form verbs with the help of the suffix -ing; translate them:

To travel, to form, to polish, to require, to involve, to transmit, to emerge.

IX. Translate the following words, paying attention to the meaning of affixes:

Discomfort, discord, accord, untrue, decompose, discover, antibody, non-inductivity, dislocation, nonresistant, invariable, anticipate, disappearance, disgrace, rearrangement, reconstruct, ex-champion, ex-president, prefabricate, post-war, post-revolutionary, supersonic, co-author, extraterritorial, prehistoric, ultramodern, superconductivity, translation, extraordinary, coexistence, ultrasonic, creative, reflective, attractive, demonstrative, co-chairman, co-operative, interrelation, illustration, illumination, understandable, unbearable, unlivable, immovable, irrational.