Lenses : Concave lenses
There is a piece of history that is always with us, the watch. Watches are made of many small parts. Watchmakers use lenses to magnify these small parts and build watches.So in our article today we will study about lenses, the "Concave Lenses'' and "Convex Lenses", its properties, definition and functions.
- First : What is "Concave and Convex Lenses"?
Convex lens:
a curved piece of transparent material that is thicker in the middle than at the edges.
Concave lens:
a curved piece of transparent material that is thinner in the middle than at the edges
- Second : Ray Diagrams
A lens forms an image by refracting light rays that pass through it.
You can construct a ray diagram to determine the location, size, orientation, and type of image formed by a lens.
The properties of the images formed by a lens include:
size: smaller or larger than the object
orientation: upright or inverted
type: real or virtual
What determines the type of image formed by a lens?
The type of image formed by a lens depends on:
the shape of the lens
the position of the object from the lens
- Third : Images formed by Concave Lenses
A concave lens is a lens that is thinner in the middle than at the edges. When light rays travelling parallel to the optical axis pass through a concave lens, they bend away from the optical axis and never meet.
Step 1 : Draw a light ray from the object parallel to the optical axis. The ray is refracted away from the axis, so its extension passes through the focal point.
Step 2 : Draw a light ray from the object through the center of the lens. The light will not bend regardless of the location of the object.
Step 3 : The top of the image will be where the extension of the refracted rays meet. Notice that this happens in front of the lens.
A concave lens produces an image that is virtual, upright, and smaller regardless of the location of the object.
The Result :
The End
Thank You
By : Nooran
0 Comments