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Led glass lens tells us what the lens does.
- Aug 13, 2018 -

Led glass lenses bring everyone to understand the application of lenses:

(1) Magnifying glass: It is a convex lens. When the object is within a focal length, it will form a virtual image of the vertical magnification. Keep the object away from the lens and the virtual image will become larger.

(2) Telescope: It is also a kind of convex lens. The longer the focal length of the objective lens is, the shorter the focal length of the eyepiece is. When looking at things, first reduce the real image in the objective lens and then enlarge the virtual image by the eyepiece. The result is that it is smaller than the real object.

(3) Slide projector: The lens is a convex lens, and the object is placed between the focal length and the double focal length, so that it will be inverted and magnified on the screen. If you want the real image to increase, you should let the object close to the focal length of one point, while away from the lens, that is, the image close to the image becomes larger.

(4) Microscope: It is composed of two convex lenses with different focal lengths. The focal length of the objective lens has a long focal length. The object will be inverted and magnified by the objective lens between the focal length and the double focal length. The object of the real image as the eyepiece is doubled by the eyepiece and becomes a virtual image in the focal length of the eyepiece.

(5) Camera: Its lens is a convex lens, and the image with a long focal length is relatively large. The single-person imaging is large, the camera should be close to the person, and the lens is rotated out to increase the distance. Collective illumination should keep the lens away from the person while screwing in the lens to reduce the distance. If the real image is not in the center of the framing frame, the lens moves in the same direction as the image moving direction when the object is not moving.

(6) Presbyopia: the flattening of the lens is weakened, the focal length becomes longer, and the image is behind the retina. The near object is not visible. The distance of the visual vision is greater than 25 cm, and the convex lens should be corrected. (With a convex lens, the eyeball can be enhanced, the focal length becomes shorter, and the image moves forward to the retina).

(7) Myopia: the lens becomes convex, the focal length becomes shorter, the convergence is enhanced, the image is in front of the retina, and the distant object is not visible. The distance of the bright vision is less than 25 cm, and a concave lens should be worn. (The concave lens can make the eyeball convergent, and the focal length becomes longer, like the backward movement).


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