Optics_book

Language activity

Exercise 1. Summarize your knowledge of the Conditional Sentences. Translate the sentences into Russian.

Should it be desirable to divide the powder of two substances, several ways are possible.
It would be worthwhile investigating the substance mentioned, provided we could get it in sufficient quantity.
Should your work meet these conditions, it will be of great service to our industry.
Unless the cathode is water cooled, it will overheat and emit gases.
Had it not been for a large size of this body, we should have already weighed it on our pan.
If a compass needle were sensitive enough, it would swing back and forth as the waves went on.
But for space meteorological stations we would not be able to observe the formation of hurricanes.
Provided one knows the rate of the emission, one can determine the range of the particles.
If the results of their molecular weight determination had been accredited, the concept of giant molecular structures might have been established long before the 1930s.
On Venus were it not for the horrid humid climate, we should probably feel quite at home.
If atomic nuclei contain electrons, their charges should be always whole multiples of the electronic charge.
Had this material been heated, the reaction might have taken quite a different turn.
Providing that a profound change were to occur, slip ought to take place along the direction of maximum stress.

Exercise 2. Put the verbs in brackets into the correct form of Subjunctive Mood I.

If he (to understand) the situation, he (to act) differently.
If I (to be) you, I (to consider) the matter settled.
If these words (to be) synonymous, you (can use) either of them.
They (to buy) those implements if they (to need) them.
(To be) the temperature higher, the results of the test (to be) better.
If you (to classify) the data, fewer tests (to be needed).
If the sensitivity measurement of a detector (to be done) with no indication of the time of response, it (to be) of little significance.

Exercise 3. Put the verbs in brackets into the correct form of Subjunctive Mood II.

If you (to give) me more time, I (to make) a better experiment.
The results (to be) remarkable if all the figures (to be checked).
Unless there (to be) an important drawback in the design of the detector, the latter (to be used) in the experiment.
If the experiment (to be over), everyone (to leave) the lab.

Exercise 4. Open the brackets paying attention to the Conditional Sentences. Translate the Sentences into Russian.

If you studied more hard, you (can learn) English quickly.
Would you have learnt more rapidly if you (to have) more lessons in England?
Unless the atoms (to be hold) together by an externally applied pressure they cannot be brought close enough to be bonded as a solid.
If no external force (to act) on a system the total momentum of the system remains unchanged.
It would seem that a nucleus would be more stable if it (be made up) exclusively of neutrons.
Unless all the necessary mechanical and optical devices had been provided, the position and intensity of spectral lines (no to be recorded).
If you (to check) the data, you will find everything in order.

If they had mentioned this yesterday, everything (to be done).
Had he had enough time, he (to test) the equipment.
If the electrons emerged with a wide spectrum of energies, they (be bent) by varying amounts in passing through the magnetic lens and the image (be blurred).

Revise your knowledge of modal verbs.

Exercise 5. Translate these sentences into Russian having in mind the meaning of the modal verb.

Can-ability, may –permission and probability, must necessity, will-inevitability, would-insistence.

The sea can be rough in the harbour.
A scientist may freely choose his line of research.
Most people can question the uncertain, only few can question the obvious.
Good ideas should be written down before they are forgotten.
A true scientist will enjoy his work more than anything else.
Occasionally a machine will go wrong and it is impossible to find out what the matter is.
Two basic types of semiconductor laser diode can be distinguished.
Free electrons lasers require large facilities since they must make use of sufficiently large e-beam accelerators.
After a very short time the electrons in the conduction band will have dropped to the lowest level in that band.
It should be noted that preparation of laser crystals requires considerable care and skill.
The foil could be irradiated from one or both sides.

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