Английский язык. Ч.3 (Tests 10,11,12). Ильичева Н.А - 5 стр.

5. A great deal of evidence suggests that light moves from the object to our eyes
   in straight-line … (paths, routes, tracks).
6. Refraction of light may cause optical … (deceptions, illusions, errors).
7. We know that … sound waves have wavelengths of centimeters to meters
   (perceptible, distinct, audible).


C. Fill in the correct word derived from the words in brackets
                                       Polarization
   Light waves are transverse electromagnetic waves with the electric and
magnetic field vectors oscillating perpendicular to the direction of 1) …
(propagate). The atoms of a light source generally emit light waves that are
2) … (random) oriented and a beam of light has transverse field vectors in all
3) … (direct). Such light is said to be 4) … (polarize). Polarization refers to the
5) … (prefer) orientation of the field vectors. If there is some 6) … (part)
preferential orientation of the field vectors, the light is 7) … (part) polarized. If
the vectors are in a single plane, the light is 8) … (line) polarized.


D. Choose the right words from the list to fill in the spaces
White, incident, interference, parallel, red, light waves, sound waves, away
from, violet, toward, internal reflection, diffuse reflection, dispersion.


1. Rays reflected from relatively rough surfaces are not …; this is called diffuse
  reflection.
2. Because of … … in all directions, an ordinary object can be seen from many
   different angles.
3. The angle of refraction depends on the speed of light in the two media and on
  the … angle.
4. When light passes from one material into a second material where the index
   of refraction is less (say, from water into air), the light bends … the normal.
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