The function of optical lens

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Optical Lens: An optical lens functions as an optical element made of a transparent material (e.g. glass, crystal, etc.). This affects the wavefront curvature of light. It is a device that can converge or diverge light, producing both real and imaginary images. It is widely used in security, car wear, digital cameras, lasers, and optical instruments. A variety of common colorless optical glass including fused should be time, calcium fluoride, magnesium fluoride, silicon, germanium, zinc selenide and other materials; and plano-convex lenses, biconvex lenses, plano-concave lenses, biconcave lenses, super-hemispherical lenses, spherical lenses, curved-moon lenses, columnar lenses, bar lenses, glued lenses and so on.
and the law of imaging of an optical lens convex lens.
1. lenses are represented by the lens symbol with two V-shaped marks at each end of the line segment.
Draw the principal optical axis and mark the optical center and focal point. According to the lens of the intersection of two of the three special light rays of refraction (generally to pass through the optical center and parallel to the main optical axis is preferred).
Characteristics of the image formed by the lens (e.g., reality and falsehood, size, positive and negative, etc.) Can be obtained.
2. lens imaging, the object on each point of light emitted by all the imaging in the same location, blocking a part of it, does not affect the other rays of light hitting the lens imaging, the
So the complete image can still be seen. However, the brightness of the image on the screen is dimmed because less light hits the image.
3. Convex lens imaging law;
(1) convex lens to become a real image need to meet the conditions are
(2) Conjugate imaging means that the magnitudes of the object and image distances can be interchanged, and in both cases the inverted real image can be magnified and reduced, respectively.
(4) When you look through a convex lens at a clock twice the focal length away, the image of the second hand still rotates clockwise because the inverted real image is still in the normal direction and therefore still rotates clockwise.
Using lens symbols (a line segment with two V-shaped marks at each end), draw the principal optical axis, marking the center of light and the focal point. Depending on the intersection of two of the three special rays of the lens that are refracted (the ray whose center of light is parallel to the main optical axis is generally preferred), the characteristics of the image formed by the lens (e.g., reality and falsehood, size, positive and negative, etc.) can be obtained.
2. Lens imaging, the object on each point of light emitted by all the imaging in the same location, blocking a part of it, does not affect the other rays of light hitting the lens imaging, so you can still see the complete image. However, the brightness of the image on the screen is dimmed because less light hits the image.

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