Learn Science [Form 2]

YOU ARE READING

Random

This book is not a story. This book is a study book for those who likes to study science. I put this way for those who are so lazy to study in their actual books. So, yeah. Hope this book helps you for your knowledge about science. Actually, the les...

#chapter #educational #learn #lesson #science #study

Chapter 1 - Lesson 7 part 1

Start from the beginning

by CutieKittyMe

2 The refraction of light occurs when the speed of light changes. This happens when light travels through two types of media that have different densities.

3 (a) The speed of light decreases when light enters a denser medium, for example, from air to glass.
(b) It increases when light enters a less dense medium, for example, from glass to air.

4 When light travels at an angle from a less dense medium to a denser medium, it is refracted towards the normal. This is shown in Figure 1.20 when light travels from air through the glass block.

5 When light travels from a dense medium to a less dense medium, it is refracted away from the normal. Figure 1.20 shows propagation of light rays from the glass block to air.

20 shows propagation of light rays from the glass block to air — Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.

Figure 1.20 Refraction of light when light travels from (a) air into glass and from (b) glass into air

×××××

ACTIVITY 1.4 : Studying the refraction of light

Figure 1.21

Procedure
1 A rectangular glass block is placed on a piece of white paper. The outline of the glass block is drawn on the white paper.

2 A beam of light from a ray box is directed at an angle to the glass block (Figure 1.21).

3 Two crosses are drawn on the beam of light which travels towards and away from the glass block.

4 The glass block is removed and the path of light is drawn on the white paper.

5 Steps 2 to 4 are repeated but this time the beam of light is directed to a right angle to the glass block.

Observation