COCO OPTICS
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26
2023
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04
Lens knowledge points
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Magnifier: A convex lens with a short focal length that can magnify smaller objects, but the object must be within one focal length of the convex lens, presenting a magnified upright virtual image
2. Projector: The lens of a projector is equivalent to a convex lens, which uses the convex lens to form an enlarged image
3. Camera: The lens of a camera is equivalent to a convex lens, which is used to form a reduced image. The light from the object eventually converges on the film to form a reduced "inverted real image" (the real image is formed by the convergence of actual light, and the film is sensitive to light, so it can form a real image)
4. Microscope: composed of two convex lenses, the real image of the observed object magnified by the objective falls within the focal length of the eyepiece, and the virtual image magnified again is seen. The objective of the microscope is equivalent to a projector, forming an inverted magnified real image; An eyepiece is equivalent to a magnifying glass, forming an upright magnified virtual image
Telescope: The objective and eyepiece of a telescope are both composed of convex lenses, and distant objects pass through the objective to form a reduced real image, forming an enlarged virtual image within the focal length of the eyepiece; The larger the objective lens, the brighter the appearance of distant objects; The distance between the objective lens and the eyepiece should not exceed the sum of two convex lens focal lengths; The objective lens in a telescope is equivalent to a camera, standing upside down and reducing the actual image; An eyepiece is equivalent to a magnifying glass, forming an upright and magnifying virtual image
Latest News
2023-04-26
Differences and laws of lenses
Different structures A convex lens is composed of a transparent mirror body ground into a spherical surface on both sides, with thin sides and thick middle.
2023-04-26
Classification of lenses
Convex lens A convex lens is a lens with a thicker center and thinner edges. Convex lenses have the function of converging light lines, so they are also called "converging lenses" or "positive lenses" (can be used for farsightedness and reading glasses). This type of lens can be divided into:
2023-04-26
What is the definition of a lens and what is a lens?
There are six types of lenses. A lens is made according to the laws of light refraction. A lens is an optical element made of transparent substances such as glass, crystal, etc. A lens is a refracting mirror with two spherical surfaces, or a transparent body with one spherical surface and one plane. The image it forms has both real and virtual images. Lenses can generally be divided into two categories: convex lenses and concave lenses.
2023-04-26
Lens knowledge points
Magnifier: A convex lens with a short focal length that can magnify smaller objects, but the object must be within one focal length of the convex lens, presenting a magnified upright virtual image
2023-04-26
Summary of Lens and Its Application Knowledge Points
1. Convex lens: A lens with a thick center and thin edge, which has a converging effect on light, so it is also called a converging lens.