Light is one of the electromagnetic waves
under certain conditions can behave like a particle and a wave. As a wave,
light can propagate in a straight line, can be reflected, refracted, and
experience the polarization and interference.
1. Reflection of Light
Properties of light waves that we see most
often is the reflection of light.
b. Diffuse reflectance is the reflectance of light that occurs on uneven surfaces. For example walls and wood.
2. Reflection
the mirror on the flat
The statement, known as Snell's law of reflection of light (rays), are
:
a. Rays come, the normal line, and the reflected rays lie in
one plane.
b. Angle of incidence equal to angle reflection.
Flat mirror will produce regular reflection. Therefore, the image
produced can be described by using the law of Snell's proposed light reflectance.
The properties of the image produced by a plane mirror is virtual, erect and size
as large.
To better
understand, try to see
the video as an image formation by plane mirror
If two plane mirrors
arranged so that an angle α will be obtained a few shadows. Many of the images
forming between the two mirrors can be expressed in the following equation.
n : many shadow forming
α : angle is flanked by two mirrors
3. Reflection on the concave mirror
Concave mirror is a mirror that has a
reflective surface curved inward. Is convergent or concave mirror to collect
light. Parts of the concave mirror:
a. P : the center of curvature
mirror
b. F : the focus point
c. O : center point of the
mirror surface
d. OF
: focus distance, length is half the radius of curvature of the mirror ( f
)
e. OP : The main axis of the
mirror
f. R1, R2, dan R3 :
space
in front of the mirror
g. R4 :
space
behind the mirror
The rays particular concave mirror :
a. Rays come parallel to the main axis is reflected through the focus point,
b. Rays coming through the focal point is reflected parallel to the main axis, and
c. Rays coming through the center of curvature of the mirror is reflected by rays as well.
To better
understand, try
to see the video as an
image formation by concave mirror
The nature of shadow forming the concave mirror can also be determined in the
following ways.
a.
If s' value
(+) then the image is real and inverted, but if s' value (-)
then
the image is virtual and upright.
b. If M>
1
then the image is enlarged. If M = 1 then the image as large as the object. If M <1
then the
image is minimized.
4. Reflection
on the convex mirror
Convex mirror is a mirror that has a curved reflective
surface to the outside. Concave mirror is diverging or spreading of light.
Parts of the convex mirror
Explanation :
a. P :
the
center of curvature mirror
b. F :
the focus point
c. O :
center
point of the mirror surface
d. OF :
focus
distance, length is half
the radius of curvature of the mirror ( f
)
e. OP :the
main axis of the mirror
The rays particular convex mirror :
a. Rays coming parallel to the main axis is reflected as if coming from the focal point.
b. Rays come into the focus point is reflected parallel to the main axis.
c. Rays come into the center of curvature of the mirror will reflect light coming through.
To better
understand, try
to see the video as an
image formation by convex mirror
The nature of images forming the convex mirror has a trait that is virtual, upright, and minimized.
The equation is valid for concave mirrors and convex mirrors are as follows:
Explanation:
f : focusing mirror (cm
atau m)
s0 : distance of objects in
the mirror (cm atau m)
s1 : distance to the mirror image (cm
atau m)
R : the
radius(cm atau m)
h1 : high shadow (cm
atau m)
h0 : high objects (cm
atau m)
M : magnification
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