Definition and Types of Convex Lenses
Convex Lens - Convex lenses are one type of lens that is widely used in human life. The use of convex lenses is generally used to magnify the effects of shadows on an object. Some objects that use convex lenses such as glasses, binoculars, projectors, etc.
Convex lens
In this article we will review about the Definition of Convex Lenses, Formulas, Types, Properties, and Special Rays of Convex Lenses.
Understanding Convex Lens
Convex lens is a lens in the middle which is thicker than the edges or bulging. Convex lenses are generally circular in shape and are made of glass or plastic so that they have a refractive index greater than the refractive index of the air. Convex lenses have the nature of a real image, inverted, and enlarged.
Convex Lens Type
Convex Lens: Definition, Formula, Type, Nature, and Special Light
Based on its shape, convex lenses can be divided into 3 types, namely:
Biconvex or double convex.
Plankonveks or flat convex.
Concave or convex concave.
Special ray Convex lens
In the picture above is a special ray on a convex lens:
Image a. Rays coming in parallel to the main axis will be refracted through the focal point (F1) behind the lens.
Figure b. Rays coming towards the focus point in front of the lens (F2) will be refracted along the main axis.
Image c. The light coming through the optical center of the lens (O) is continued, not refracted.
Convex Lens Properties
In a convex lens, light can come from two directions so that the convex lens has 2 focus points. The front convex lens is where the light comes in and the rear convex lens is where the light is refracted.
When the 3 rays come in parallel and are directed to the convex lens, the beam will be refracted by the lens and intersect or go to a point. The focal point located at the front of the convex lens is called the virtual focus point or passive focus (F2) and the focus point at the back of the convex lens is called the true focus point or active focus (F1).
Convex lens is convergent (collecting). Because the light that comes through the convex lens is always refracted to a point or gather light, the convex lens is called a converging (collecting) lens.
The convex lens focus distance is always positive because the intersecting spot or refractive ray destination is always located on the back of the convex lens so the convex lens focus is the true focus.
The amount of light refraction on a convex lens is affected by the refractive index of the lens material and the curve of the lens surface. While the refractive index itself depends on the speed of light propagation in the lens.
A thick convex lens will produce a greater light bias than a thin convex lens. In addition, a thick convex lens will also produce a shorter lens focal length than a convex lens that's simple.