Submitted by: Submitted by ttting
Views: 223
Words: 5478
Pages: 22
Category: Other Topics
Date Submitted: 10/01/2012 11:43 PM
3A Wave Motion I
Chapter 1
Reflection of Light
1
1 2 3 C C
Reflection of Light
(c)
Practice 1.1 (p. 5)
Luminous objects: candle flame, lighted lamps and the sun Non-luminous objects: books, blackboards and the moon (Or other reasonable answers)
4
(a) Divergent (b) Divergent (c) Parallel 5 Angle of incidence = 90 25 = 65 Angle between the incident ray and the reflected ray = 65 + 65 = 130 6 (a) Angle of incidence = 90 30 = 60 (b)
5
(a)
(b)
(c)
Angle of reflection for the final reflected ray =z
Practice 1.2 (p. 10)
1 2 3 4 C A C (a) Angle of incidence = 90 40 = 50 (b) Angle of reflection = angle of incidence = 50 7
= 90 y = 90 x = 90 60 = 30 The surface of glossy paper is flat and light is reflected regularly. The large amount of light reflected by the glossy paper makes it difficult to read the prints.
New Senior Secondary Physics at Work
1
Oxford University Press 2009
3A Wave Motion I
Chapter 1
Reflection of Light
8
(a) When the surface of the water is ruffled, diffuse reflection occurs to produce a distorted image. (b) John’s explanation is wrong. The reflection of light still obeys the laws of reflection. The parallel rays are reflected towards different directions because the normals at different positions point towards different directions.
8
(a)
Practice 1.3 (p. 21)
1 2 3 4 5 6 (a) Height of her image = 1.4 m (b) Any two of the following: virtual; as far behind the mirror as the girl is in front; of the same size as the girl; erect; laterally inverted. 7 (a)&(b) 10 If the photograph is taken at an angle to the mirror surface, less light will be reflected by the mirror back to the camera and a better photograph will be taken. 11 (a) Distance setting = 3 m + 3 m =6m (b) No. This is because the camera focuses on the mirror instead of the image. The mirror is in front of the image to be photographed.
New Senior Secondary Physics at Work 2 Oxford...