Английский язык. Ч.3 (Units 9,10). Ильичева Н.А - 11 стр.

  2. Rays reflected from relatively uneven surfaces don’t run side by side
    having the same distance between each other at every point.
  3. Mirrors whose surface is curved outwards are used on cars and trucks and
    in shops (to watch for thieves).
  4. Refraction is responsible for false visual perception in a number of
    common cases.
  5. Waves move away from a straight-line path when they pass through a
    narrow opening.


7. Match the words to their opposites.
1) enter                                    �) diverge
2) reflect                                  b) smooth
3) rough                                    c) wide
4) convex                                   d) concave
5) converge                                 e) leave
6) bulge out                                f) weaken
7) enhance                                  g) absorb
8) visible                                  h) invisible
9) narrow                                   i) destructive
10) constructive                            j) sink


8. Fill in the necessary antonyms from exercise 7.
  1. a) Distant stars are … to the naked eyes.
    b) They cut the trees down to make the lake … from the house.
  2. a) A … mirror has a curved surface like the outside of a ball.
    b) A mirror is … if its surface is curved inwards like the inner surface of a
       sphere.
  3. Light rays are refracted on a) …ing the glass and refracted again on
    b) …ing the glass.
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