Experiment : Reflaction

After learn the material about reflaction. Try do the  experiment below!

***Good Luck***

Experiment : Refraction Of Lens

After learn the material about refraction of lens. Try doing  the following experiment is consistent with the existing link!

 Click link below to start experiment

 phet.colorado.edu/sims/geometric-optics/geometric-optics_in.html

Experiment : Refraction

  After learn the material about refraction. Try doing the following experiment is consistent with the existing link!

Click link below to start experiment 
phet.colorado.edu/in/simulation/bending-light

TEST : Refraction Of Lens

After learn the material aboout refraction of lens. Try to do about this below!

Problem for Individual

1.     Why rearview mirror is formed of convex mirror?

EVALUATION TEST

          Answer the following questions correctly!

1.        Explain the processes that form a special rays of a concave lens!

2.        Mention properties the image produced from a convex lens when the object is right at the focal point!

                                              ***Good Luck***

TEST : Refraction

After learn the material refraction. Try to do about this below!

Problem for Individual

1.       Explain the refraction Snell's law!

 

EVALUATION TEST

Answer the following questions correctly!

1.        Explain the refraction Snell's law!

2.        If the refractive index of 1.5 and a medium fast propagation of light in the room empty 3x108 m / s. Rapid propagation of light in a medium that is..............

                                                *** Good Luck****

TEST : Reflection

                                 

After learn the material about reflection. Try to do about this below!

Problem for Individual

     Why is a good tool for reflection is a flat mirror?

.................................................................................................................................

EVALUATION TEST

Answer the question below correctly and completely!

1.        Calculate distance the shadow of an object when the focal point of 20cm convex mirror. Objects placed in front of the mirror with a distance of 10cm  !

2.        Mention properties the image produced from the rearview mirror!

                                                  *** Good Luck***

LIGHT : Refraction of Lens

Material :

The Refraction Lens

The lens is a transparent object is bounded by two curved area or areas of curved and flat fields. Lenses are of two kinds, namely concave lenses and convex lenses.

a.       Refraction of the concave lens

Concave lens is a lens that is spreading so-called light diverging lens. The radius of curvature of the concave lens is negative.

 

O : lens focal point 
F₁ : focal point of the first concave lens surface
F_{2 :} focal point of the second concave lens

There are several kinds of concave lenses, convex lenses are concave, plan concave lenses, and lens bikonkaf.

 

Concave lens has three special rays which are:

 

(a) major axis parallel rays come, (b) light coming through the optical center, and  (c) rays come into focus point  

The rays Particular are as follows :

                a.  Rays coming parallel to the major axis is refracted as if coming from the focal point.

b.  Rays coming through the optical center will be forwarded without refracted.

c.  Rays will come into focus point is refracted parallel to the main axis.

The equation applies to the concave lens is as follows:    

Magnification on a concave lens can be searched by using the formula:

b.        Refraction of the convex lens

Convex lens  is a lens that collects light that is called a converging lens. In contrast to the concave lens, the radius of curvature of a convex lens is positive .

                   O : lens focal point

                  F₁ : focal point of the first concave lens surface

                   F_{2 :} focal point of the second concave lens

Convex lens there are three kinds, namely convex concave, convex plan, and bikonveks.

 

Convex lens has three particular rays which are:

 

(a) rays coming parallel to the main axis, (b) light coming through the optical center, and (c) light coming through the front of the lens focal

The rays in particular convex lens is as follows:

a. Major axis parallel rays come to be refracted through the focal point.

b. Rays coming through the optical center will be forwarded without refracted.

                c. Rays coming through the front of the lens will focus parallel to the principal axis is refracted.

The equation applies to the convex lens is as follows:

Magnification on a concave lens can be 
searched by using the formula :    
                       
                            

To better understand, try to see the video as the image formation by concave and convex lenses

The Power of Lens

Power of the lens is the ability of a lens to collect light at the lens convex and concave lenses to spread light on. The greater the power of a lens, the greater the lens bend light. Power of the lens can be formulated :

   

Keterangan:

P : the power of lens (dioptri)

f : focusing lens (m)

 

LIGHT : Refraction

Material :

What causes light to refract?

             Light changes speed as it enters from one medium to another and bends. The bend of light depends on the refractive index of the medium. Different mediums have different refractive index and density.

Refraction of light is incident ray tilt or light when it passes through two different media. Refraction of light occurs when light through two different medium density. As the density of water is greater than the density of air, while air has a density of more tenuous than the density of the glass. In general there are two kinds of refraction:

a.    Rays coming from the media more more tenuous to the media that tightly will be refracted near the normal line (i> r)

b.    Rays coming from the media more tightly into a more tenuous medium will be refracted away from the normal line.

These images shows the refraction of light:

 
The light bends as it passes from air to water.

A prism refracts light at different directions to form a rainbow.

In the refraction effect of refraction Snell's law, which reads as follows. 1. Rays come, the normal line, and the refraction ray is located in one plane. 2. Comparison between the projection and projection ray rays come to the field boundary refraction is a remains number called the relative refractive index.

The diagram below shows the refraction of light when it passes from one medium to another. The red line is the normal, which is perpendicular to the surface of the medium. As the light passes through the second medium, the light bends towards the normal because density of the second medium is greater than the first. The angle between the incoming ray and the normal is the angle of incidence. The angle between the refracted ray and the normal is the angle of refraction.

Mathematical formulation of Snell's law is :

or 

or

The symbol θ1, θ2 refers to the angle of incidence and refraction angles, v1 and v2 on the speed of light rays come and light refraction. The symbol refers to the refractive index n1 medium through which the rays come, while n2 is the refractive index of the medium through which light refraction.

 To better understand, try to see the video as an application of refraction