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Article about Converging (convex) lens
Definition of the convex lens
One type of lens used in everyday life is the convex lens. The convex lens is a lens with a thicker middle while the edges are thinner. Convex lenses are usually circular and made of glass so that the lens has the refractive index higher than the refractive index of the air.
Types of the convex lenses
In general, there are three types of the convex lenses, in which the shape of the convex lens is as shown below (side view).
Article about Properties of image formed by diverging lens
The object distance is smaller than the focal length of the concave lens (do > f)
Based on the calculation of the image formation by the concave lens, it can be concluded that if the object distance (do) is smaller than the focal length (f), then the image properties are:
– Virtual means the beam of light does not pass through the image
– Upright
Article about Equation of diverging (concave) lens
Before deriving the equation of the concave lens, first understood the sign rules of the concave lens.
Sign rules of the concave lens
The following are the sign rules of the concave lens.
– The object distance (do)
If the object is on the side of the lens that is the same as the direction of the beam of light, then the object distance is positive.
Article about Image formation by diverging lens (concave lens)
To understand the image formation by the concave lens, look at the following example problems and solution. In this case, the object is assumed to be at a certain distance from the concave lens,
then draw the image formation by the concave lens, the image distance from the concave lens and the magnification of the image by the concave lens.
The focal length of a concave lens (diverging lens) is 20 cm. Objects with a height of 10 cm are located at the left of the lens. Determine the image distance, the magnification of the image and the height of the image, if:
Article about Ray diagrams for diverging (concave) lens
If an object is on one side of the concave lens, the concave lens can form the image of the object. If the position of the object on one side of the concave lens is known, how to draw the image formation of the object? Suppose an object is on the left side of the concave lens, as shown in the figure below.
Orange line = the concave lens
Blue line = the principal axis
Arrow (green) = object
F1 = the focal length 1 and F2 = the focal length 2
Article about Diverging (concave) lens
Definition of the concave lenses
One type of lens used in everyday life is the concave lens. A concave lens is a lens with a thinner center while thicker edges. The concave lenses are usually circular, although there are also lenses that are not circular. The concave lenses, like convex lenses, are made of glass so that the lens has a refractive index greater than the refractive index of the air.
Types of the concave lenses
In general, there are three types of the concave lenses, where the shape of the lens looks like in the figure below (side view).
Article about Properties of image formed by convex mirror
The object distance is smaller than the focal length of the convex mirror (do < f)
Based on the calculation of the image formation by the convex mirror, can be concluded that if the object distance (do) is smaller than the focal length (f), the properties of the image are:
– Virtual means the beam of light does not pass through the image because the image is behind the convex mirror
– Upright
– The farther the object is from the convex mirror, the smaller the image size
Article about The convex mirror equation
First, understand the sign rules of the convex mirror.
The sign rules for the convex mirror
– Object distance (do)
If an object is in the front of a mirror surface which reflecting light, where the light passes through the object, then the object distance (do) is positive.
– Image distance (di)
Article about Image formation by the convex mirror
To understand the formation of image by the convex mirror, learn the example problems and solution below. In this case, an object is assumed to be at a certain distance from the convex mirror,
then draw the image formation by the convex mirror, the image distance from the convex mirror and the magnification of image by the convex mirror.
Suppose a convex mirror has a radius of 30 cm. Draw the image formation then determine the image distance and the magnification of the image, if:
a) The object distance is smaller than the focal length (do < f)
b) The object distance is the same as the focal length (do = f)
Article about Ray diagrams for the convex mirror
If an object is in the front of a convex mirror surface that reflects light, the convex mirror will form the image of the object. If the distance of the object from the convex mirror is known, how to draw the image formation of the object? Suppose an object is in the front of a convex mirror, as shown in the figure below.
The orange line = convex mirror
Blue line = the principal axis
Green arrow = object
R = center of curvature of the convex mirror
f = focus of the convex mirror
