SPM Form 4 Physics Chapter 5 Light

1. Physics
Chapter 5 Light (F4)
Chapter 6 (KSSM)
Philip Sim

2. Concept Map

3. Laws of Reflection
On the same plane:
• Incident ray
• Reflected ray
• Normal line
Angle of incidence, i
=
Angle of reflection, r
https://www.quora.com/What-is-the-relationship-between-the-
angle-of-incidence-and-angle-of-reflection-in-a-plane-mirror

4. Example: Plane Mirror
Object

5. Example: Plane Mirror
3 m 3 m
1 m 1 m

6. Example: Plane Mirror
3 m 3 m
1 m
2 m 2 m
How
about
the
moving
speed ?

7. Example: Plane Mirror
N
O
A B
Find the angle of
deviation of reflected ray
if the plane mirror is
rotated clockwise by 20 °
20°
B’

8. Circle
Can you find the normal line ?
c

9. Common Terminology of Curved Mirror

10. Common Terminology of Curved Mirror
Focal point F
It is a point where the ray converges to after reflected from the concave
mirror or appears to diverge from after reflected from the convex mirror
Focal length f Distance between focal point F and the mirror pole P
Center of curvature C The geometric center of a concave or convex mirror
Radius of curvature r r = 2 f
Object distance u Distance between object and the mirror pole P
Image distance v Distance between image and the mirror pole P

11. Image Formed by Concave Mirror
• Object at C ( u = 2f )
• Image
• Same size as the object
• Real
• Inverted

12. Image Formed by Concave Mirror
• Object beyond C ( u > 2f )
• Image
• Diminished in size
• Real
• Inverted

13. Image Formed by Concave Mirror
• Object between C and F
( 2f > u > f )
• Image
• Magnified in size
• Real
• Inverted

14. Image Formed by Concave Mirror
• Object at F ( u = f )
• Image
• It is at infinity
• Application: Touch light reflector

15. Image Formed by Concave Mirror
• Object at F ( u < f )
• Image
• Magnified
• Virtual
• It is behind the mirror
• Upright
• Application: Make-up mirror

16. Image Formed by Concave Mirror
• Object at infinity
• Image
• Diminished in size
• Real
• Inverted
• Application:

17. Image Formed by Convex Mirror
• Object distance u > f
• Position of image
• Behind the mirror
• Image distance v < focal
length f
• Image
• Diminished in size
• Virtual
• Upright

18. Image Formed by Convex Mirror
• Object distance u < f
• Position of image
• Behind the mirror
• Image distance v < focal
length f
• Image
• Diminished in size
• Virtual
• Upright

19. Image Formed by Convex Mirror

20. Thank You

21. SPM online Tuition
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