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Sunday, February 9, 2020
What is the difference between a convex and a concave lens?
Lenses are used in glasses, telescopes, microscopes, flashlights, and many more helpful objects.
A convex lens is a lens that is thick at the center compared to the edges. Convex lenses are also called converging lenses because as the light passes through the lens the rays come together at a focal point.
As the light passes through the lense it bends the light towards the center.
A convex lens is called a positive lense because the location of the focal point is in front of the lens.
A convex lens has the ability to magnify things and make them look bigger.
The human eye uses a convex lens to focus light and a convex lens can be used to correct long-sightedness or hypermetropia.
A convex lens is also used in a microscope and telescopes.
A concave lens is thicker at edges compared to the middle.
You can remember a concave lens because you are going into a cave.
It is also called a diverging lens because as the light passes through the lense they separate from one another.
As the light passes through a concave lens the light is bent outward from one another.
A concave lens is called a negative lense because the focal point is behind the lens.
It is used to correct short-sightedness or myopia.
Concave lenses are used in flashlights to spread out the light.
Binoculars and telescopes use convex lenses to magnify objects and make them appear closer, but the image may be blurry. Binocular and telescope manufacturers use concave lenses in the eyepieces to help focus images more clearly.
Door viewers or peepholes use concave lenses in order to have a wide view of the area.
Summary Chart of Convex and Concave Lenses
Convex
Concave
Structure
Thicker at the center compared to the edges
Thinner in the middle compared to the edges
Alternate
Name
Converging Lens
Positive Lens
Diverging lens
Negative lens
Light Rays
Bend towards the center
Bend away towards the outside
Use
Our eyes, correct long-sightedness, hypermetropia,
telescope, microscope
Correct nearsightedness,
myopia
Focal Point
Positive focal point
Negative focal point
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