1. Light is an electromagnetic wave that consists of oscillating electric and magnetic fields perpendicular to each other and the direction of propagation. 2. Light can be reflected, refracted, interfered with, diffracted, and polarized as it interacts with surfaces and materials. 3. When light hits an opaque surface, none of the light passes through. When it hits a transparent surface, some of the light passes through, and when it hits a clear surface, almost all of the light passes through.

2. Light is an
electromagnetic
wave, namely the
wave the vibration
of which is electrick
field and magnetic
field.
VIDEO
DEFINITION OF LIGHT

3. 1. Spreading According to Straight Line
2. Has Energy
3. Can be Seen
4. Radiated in the Form of radiation
5. Has Spreading Direction
Perpendicular to Vibration Diraction
6. Can Experience
Reflection, Refraction, Interference,
Diffraction and Polarization

4. DARK BODY
Dark body if gets light can be
seprated into 3 kinds, namely :
1. Opaque body, namely a dark body that
doesn’t continue at all the light it recieve.
Exampe : carton, book, wood, and so on

5. 2. Transparent
body, namely a dark
body that continue
a part of light it
recieve. Example
thin paper.
3. Clear body, namely
dark body that
continue almost all
light it recieve.
Example clear glass
Pictu
re
Pictu
re

9. What’s mean by UMBRA and
PENUMBRA ?

11. Law of Light
Reflection
a. Incident angle, normal line and
reflected ray lie on one flat plane.
b. Incident angle is equal to reflected
angle ( i = r ).

12. Regula
r
Reflect
Irregul
ar
Reflect
ion

13. Light Reflection on Flat
Mirror
o Properties that image in
flat mirror:
a. Virtual image
b. Upright as the body
c. Same size with the body
d. Facing perverted with the body
e. Distance of the body to the
mirror is equal to distance of
image to the mirror

14. Light Reflection in Concave
Mirror
a. P, namely a center of
curvature of the mirror.
b. R, namely a radius of the
mirror
c. F, namely focal point
(FP=FO)
d. O, namely intersection point of main axis with
concave mirror
e. F, namely distance of mirror focus from the
point F to point O
f. Main axis is the line that passes through the
center of curvature and center point of mirror
plane

15. The magnitude of (f) is half of radius of
curvature of the mirror.
Normal line in in the concave mirror’s the
line that relates the center point of
curvature of mirror P with the ray falling
point on the mirror.
f = ½R
Normal Line

19. Properties of Object Image Formed in the
Concave Mirror Based on it’s Position
a. Object Lies Infront of P
b. Object Lies Between
P and F
c. Object Lies Between
F and O

20. d. Object Lies
at the Point P
e. Object Lies
at F

21. Object distance to the
mirror, image distance to the
mirror, and focus distance.So
the formula:
10 S
1
S
1
f
1
f = ½R

22. Image magnification’s defined as ratio
between heigh (distance) of the
object
o
i
o
i
S
S
h
h
M
objecttheofheighth
imagetheofheighth
ionmagnificatimageM
o
i

23. Light Reflection in Convex Mirror
Particular rays in the convex mirror :
a. The incident ray parallel to main axid’s
reflected seemed comes from focal point of
the mirror (F)
b. Incident ray to focal point (F) is reflected
parallel t main axis
c. Incident ray to enter of curvature of mirror
P is reflected back semmed comes from the
center point of curvature (on the same line)

24. Light Refraction
Light refraction’s light bending that
spreads from one medium to another
medium of different density.

26. Based on Snellius’s Law, refraction be
formulated as follows:
rsin
isin
η

27. nC
C
η
mediuminvelociylightC
m/s10x3isvacuuminvelocitylightC
mediumofindexrefractiveη
n
8

28. In wave there’s relationship between
veocity, wave length and frequency, namely
relationship
λ.fC
nC
C
η
nn f.λ
f.λ
nλ
λ
η
mediuminwavelenghtlightλ
airinwavelenghtlightλ
mediumofindexrefractionη
n

29. Optical Things That Can Make Light
Refraction
1. Planparallel Glass
is the tick glass the surface of which’s flat.
and
i = angle of incident ray (air to planparallel glass)
r = angle of refracted ray (air to planparallel glass)
i’ = angle of incident ray (planparallel glass to air)
r’ = angle of refracted ray (planparallel glass to air)
i = r’ r = i’

31. Power Of Lens
P = power of lens
f = focus distance
f
1
P