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

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Unit 9
Geometric Optics. Physics Optics
Lead-in
1. a) Which of the following objects are seen as: a) a source of light; b) by
light reflected from it?
The Moon, the Sun, a table lit by a torch in a dark room, a stage lit by
several powerful spotlights, a lightbulb, a flame, a star.
b) Why is the sense of light extremely important to us? (Because it
provides us with …).
c) What phenomena caused by wave effects (particularly sound and light
waves) are you aware of?
2. Read the following summary and fill in the gaps with the given words.
Then read the text to see if you were right:
equal – ɪɚɜɧɹɬɶɫɹ; reflection – ɨɬɪɚɠɟɧɢɟ; deviation – ɨɬɤɥɨɧɟɧɢɟ; angle of
incidence – ɭɝɨɥ ɩɚɞɟɧɢɹ; surface – ɩɨɜɟɪɯɧɨɫɬɶ; dispersion – ɪɚɫɫɟɢɜɚɧɢɟ;
interference – ɢɧɬɟɪɮɟɪɟɧɰɢɹ; convex – ɜɵɩɭɤɥɵɣ; concave – ɜɨɝɧɭɬɵɣ;
medium – ɫɪɟɞɚ.
Light can be carried from place to place by particles or by waves. When light
strikes the 1) … of an object, it deviates from its original direction. This change
in direction is called 2) …When a narrow beam of light strikes a flat surface, we
define the 3) … … … The law of reflection states that the angle of incidence
4) … the angle of reflection. Reflecting surfaces do not have to be flat. Spherical
mirrors can be 5) … when the centre of the mirror bulges toward the viewer or
6) … when the centre of the mirror sinks away from the viewer. Refraction takes
place when light passes from one 7) … into another. 8) … is caused by the fact
3
                                      Unit 9
                       Geometric Optics. Physics Optics


Lead-in


1. a) Which of the following objects are seen as: a) a source of light; b) by
light reflected from it?
     The Moon, the Sun, a table lit by a torch in a dark room, a stage lit by
    several powerful spotlights, a lightbulb, a flame, a star.


  b) Why is the sense of light extremely important to us? (Because it
      provides us with …).
  c) What phenomena caused by wave effects (particularly sound and light
     waves) are you aware of?


2. Read the following summary and fill in the gaps with the given words.
   Then read the text to see if you were right:
equal – ���������; reflection – ���������; deviation – ����������; angle of
incidence – ���� �������; surface – �����������; dispersion – �����������;
interference – �������������; convex – ��������; concave – ��������;
medium – �����.
  Light can be carried from place to place by particles or by waves. When light
strikes the 1) … of an object, it deviates from its original direction. This change
in direction is called 2) …When a narrow beam of light strikes a flat surface, we
define the 3) … … … The law of reflection states that the angle of incidence
4) … the angle of reflection. Reflecting surfaces do not have to be flat. Spherical
mirrors can be 5) … when the centre of the mirror bulges toward the viewer or
6) … when the centre of the mirror sinks away from the viewer. Refraction takes
place when light passes from one 7) … into another. 8) … is caused by the fact
                                        3

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