Everything You Need To Know To Find The Best double concave lens
Double Concave Lenses ( Read ) | Physics | CK-12 Foundation
16.2.8: Double Concave Lenses - Physics LibreTexts
Images in Double Concave Lenses
Every concave lens causes all rays to diverge. Rays that approach the lens parallel to the principal axis refract as if they came from the focal point.
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As you can see in the figure above, the light rays hit the lens and refract away from each other. Since none of these rays will intersect, a real image cannot exist. Instead, all images created by a double concave lens are virtual images. Like in all ray diagrams, images can be found using two rays.
The first ray, shown above, begins from the tip of the image and travels to the lens parallel to the principal axis. Within the lens, this ray is refracted away from the principal axis such that the virtual ray (shown as a dotted line) travels back to the focal point. The second ray also leaves from the tip of the object, and travels straight through the center of the lens. The image will be where these two rays intersect - one real and one virtual. Since one ray is a virtual ray, the image will always be virtual, as well as upright and diminished.
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Like for convex lenses, the lens equation and magnification equations can be used to calculate image size and distance for double concave lenses. When using the lens equation with a concave lens, however, the focal length must be assigned a negative value.
In the Contact Lens simulation below, the Lens Slider allows you to choose between a converging (convex) contact lens and a diverging (concave) contact lens. Try to view different objects at different distances using these two lenses and determine what is the best shape for the contact lens: