6.3 Image formation by lenses 4 gama

PHYSICS
CHAPTER 6 CAHAYA & OPTIK

6.3 IMAGE FORMATION BY LENSES

LENS IS A PIECE OF THERE ARE TWO
T R A N S PA R E N T MAIN TYPES OF
LENSES, CONVEX
MATERIAL SUCH AS LENS AND CONCAVE
GLASS, PERSPEX OR
LENS
PLASTIC
2
HAS TWO SURFACES
WITH AT LEAST ONE

SURFACE CURVED

O B S E R VAT I O N

What happens to the three beams of light after
passing through convex lens?
Parallel light rays will converge at a focal point, F

What happens to the three beams of light after
passing through concave lens?
Parallel light rays will appear to be diverging
from a focal point, F

3

OPTICAL TERMS

4

POSITIONS AND CHARACTERISTICS OF 1
IMAGES FORMED BY LENSES 2
3
1

2

3

5

FORMATION OF IMAGES BY
CONVEX LENS

6

FORMATION OF IMAGES BY
CONVEX LENS

7

u<f F 2F FR

2F F 8
f

u=f F 2F FR

2F F 9
f

f<u<2f F 2F FR

2F F 10
f

u=2f F 2F FR

2F F 11
f

u>2f F 2F FR

2F F 12
f

Conclusion R: Real FR
I: Inverted
RID RIS RIM VUM VUM D: Diminished 2F
u<f S: Same size
u>2f 2F f<u<2f uF= f M: Magnified 13
V: Virtual
u=2f
U: Upright F

f

FORMATION OF IMAGES BY
CONCAVE LENS

14

u=2f F 2F FR

2F F 15
f

u=f F 2F FR

2F F 16
f

CONVEX LENS CONCAVE LENS

Conclusion Conclusion

17

LINEAR MAGNIFICATION, m 18

When an object is seen through a
magnifying glass at a distance less than its
focal length, the image formed is
magnified. The size of the image formed
by a convex lens depends on the position
of the object

Comparison between image size and
object size is made based on the ratio of
image height to object height

Add a Footer

QUIZ ANS: A

ANS: A 19

QUIZ ANS: D

ANS: B 20

QUIZ

ANS: D

21

22

23

24

25

THANK YOU

• Rashidah Jamil
• Guru Fizik
• SMKSBU

26