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)