1. LIGHT

2. TOTAL INTERNAL REFLECTION
LIGHT
REFLECTION
REFRACTION
LENSES
TOTAL INTERNAL REFLECTION

3. 5.1 understanding reflection of light

4. By the end of this subtopic, you will be able to;
Describe the characteristics of the image formed by reflection of light
State the laws of reflection of light
Draw ray diagram to show the positioning and characteristics of the image formed by a plane mirror

8. What are the characteristics of the image formed?
RAY DIAGRAM TO DETERMINE THE POSITION AND CHARACTERISTIC OF THE IMAGE FORMED BY A PLANE MIRROR
Object, O
Image, I
Object O placed in front of plane mirror
Measure the distance between O and mirror
Measure the same distance behind the mirror and mark with I as a image
Draw diverging ray from a point on the image, to the corner of the eye.
Draw two diverging rays from the object to the mirror to meet the diverging rays from the image
What are the characteristics of the image formed?

9. Worked Example
Plane mirror
The figure shows a parrot standing 2.5 m away from a plane mirror. If it fly 0.5 m away from the mirror, what is the new distance between the parrot and it image?

10. Application of plane mirror

12. CURVED MIRRORS CONVEX MIRROR CONCAVE MIRROR - Principal axisF C P C F
Parallel rays that strike the surface of a concave mirror will be reflected and converge at the focal point
Parallel rays that strike the surface of a convex mirror will be reflected and diverge at the focal point
- Principal axis
- Centre of curvature
- Focal point
- focal length P C F f

13. RAY DIAGRAM FOR CONCAVE MIRROR
Point of intersection is the position of the image, I P C F
1. Draw rays parallel to the principal axis and will be reflected through focal point.
2. Draw a ray through the centre of curvature, C and rays will be reflected at same line/part
3. Draw line pass through the focal point and will be reflected parallel with principal axis

14. POSITION OF OBJECT U > C C >U>F U=F U<F
U – object distance
U > C
C >U>F
U=F
U<F

15. CHARACTERISTIC OF IMAGE
REAL
INVERTED
DIMINISHED
THE CHARACTERISTIC OF IMAGE DEPENDS ON THE OBJECT DISTANCE

16. RAY DIAGRAM FOR CONCAVE MIRRORP C F
CHARACTERISTIC OF IMAGE
VIRTUAL
UPRIGHT
MAGNIFIED

17. RAY DIAGRAM FOR CONVEX MIRROR
Point of intersection is the position of the image, I P C F
1. Draw rays parallel to the principal axis and will be reflected through focal point. 2. Draw a ray through the centre of curvature, C and rays will be reflected at same line/part

18. CHARACTERISTIC OF IMAGE
VIRTUAL
UPRIGHT
MAGNIFIED
THE CHARACTERISTIC OF IMAGE DOES NOT DEPENDS ON THE OBJECT DISTANCE

19. APPLICATION OF REFLECTION OF LIGHT
MIRROR IN A METER (plane mirror)
Ammeter
PERISCOPE
MAKE -UP MIRROR (concave mirror)
MAGNIFYING MIRROR (concave mirror)- dentist
VEHICHEL MIRROR ( convex mirror)
Wider field of view