Refraction (5) of light wave cambridge.pdf

reflection of light

1. .اـًمْه
َف
ْي
ـِن
ْقُزْرَواًعِف
َا
ن اـًم
ْل
ِع
ْي
ِنْدِز
ْى
ِّبَر
ًال
َّب
َقَتُم ًالَمَعَو اًبِّيَط اًقْز
ِرَو اًعِفاَن اًم
ْل
ِع َكُلَأ
ْس
َأ
ىِّن
ِإ
َّمُه
ّٰل
ل
َا
O Allah, I ask you for knowledge that is of
benefit, a good provision and deeds that
will be accepted. [Ibn Majah and others].

2. Previous Lesson
Refraction or bending light
The presence of material slows light’s progress
The normal to the surface
1
2
3

3. Refraction
CHAPTER 13: LIGHT

4. Learning Objectives
Calculating refractive index
Investigate the refraction of light
Describe total internal reflection and how it is
used

5. REFRACTION

6. REFRACTION

9. •Light bends at interface between refractive index
–bends more the larger the difference in refractive index
REFRACTION

10. When light rays move from a less dense medium to a more dense medium they
'bend' towards the normal.
REFRACTION

11. when light rays travel from a more dense medium to a less dense medium they
'bend' away from the normal.
REFRACTION

12. To remember what happens to light when it is refracted, think of the word:
REFRACTION
TAGAGA

13. Total
Internal
Reflection
REFRACTION

14. Total
Internal
Reflection
REFRACTION

15. Refraction experiment:
Time for group work

16. REFRACTION

17. The refractive index is measure of how much the light slows When light enters more dense medium, light bend towards the normal. When
light enter less dense medium, light bend away from the normal Total internal reflection is a phenomenon when the angle of incidence is
greater than the critical angle, the light is completely reflected back. This is
used to transmit light signals over long distances with minimal loss of signal
strength. Today's Summary