1. By : Firman

2.  Luminous object is a object that can shining by
itself or emit light by itself.
 Example : Fire , sun , lamp.

3.  Non luminous object is a object that cannot
emit light itself they can only reflecting light.
 Example : Moon, Table , Chair ,etc.

4.  Light rays is a line of light.
 Light travel in all direction.
 Line of light can be seen clearly if they travel in
one direction.

5.  Transparent let light to pass on. Ex: Glass ,
windows.
 Translucent not let pass some light but pass
some light through them. Ex : Tracing Paper
 Opaque not let all light to pass through them.
Ex: wood, metal.

6.  As light cannot pass through opaque object it
will make a dark area usually behind the object
it was called shadows.
 Te size of the shadows depends on the light
source and the distance of the light source and
the object.

7.  The greater the light source there will be a
shadow that have dark in the middle and grey
surround it.
 The less the light source the darker the shadow
in the middle part.

8.  The further the distance between the object and
the light source will make small shadow.
 The shorter the distance between object and
light source it will make a big shadow.

9.  You can see object because the object is
reflecting the light and the reflected light will
be caught by our eye.

10.  Incident ray is a light that strike the surface of
something.
 Reflected ray is a light ray that is reflected from
a surface
 Normal is a line that is perpendicular at 90
degree to the surface where a ray strike.
 Angle of incidence is the angle between
incident ray and normal.

11.  Angle of reflection is the angle between
reflection ray and the normal line.
 Plane mirror is a mirror with flat surface.
 Image is appearance of an object in smooth
shiny surface.

12.  When light ray strike a smooth surface the
angle of reflection is equal to the angle of
incidence.
 When reflected light reach your eyes you will
be able to see the image.

13.  Real image
 Virtual image

14.  Real image is a image that can be projected into
flat surface.
 Virtual image is a image you see in a mirror
that are in the same size but only in opposite
directions.

15.  Light rays that strike the rough surface will not
have same angle of incidence and angle of
reflection.
 Because of this effect you will not able to see
your image in the rough surface thing.

16.  Refraction is light that is bend because of
different position of object and different
medium.
 The angle which the ray makes with normal is
called angle of refraction.

17.  Light travel in different speeds in different
media.
 If the light slows down it bends toward the
normal.
 A light ray can appear different direction than
the actual place example stone in water.

18.  Periscope is an equipment made by two plane
mirror

19.  If the sun light strikes the prism in certain
angle and stop by a white screen it will make a
range of color is spread out and called as
spectrum.
 The sun light contains different color because
have different wave length and travel in
different speed.

20.  Rainbow are appear because of the refraction
and reflection of the sun light by the water
droplets.
 There can be two rainbow if there is 2 reflection
occur.

21.  Absorbing color
 Reflecting color

22.  If all the colors are reflected the color will seem
to have white color
 If all colors are absorb the color of the object
will seem black.
 Usually object absorb some color and reflected
other colors.

23.  Because some object reflecting and absorb
some color so if you put blue glass the only
color that can be pass through is blue and the
other reflected.

24.  When different type of light color is mix up it
can make new color. Ex blue and red become
magenta.
 When three beams of light is shining into white
screen it will produce 3 secondary color and
white color.