Common Use of Lenses

Feb. 19, 2020

Optical spherical lenses are optical components made of transparent material and the surface is a part of the spherical surface. The lens is composed of several lenses. Lenses can be widely used in various fields such as security, automotive, digital cameras, lasers, optical instruments, etc. With the continuous development of the market, precise optical ball lenses have become more and more widely used. The specific applications are as follows:

1. Telescope: The telescope is also composed of two sets of convex lenses (eyepiece and objective lens). Its structure is characterized by a long focal length of the objective lens and a short focal length of the eyepiece. The imaging principle of the telescope is: the role of the objective lens is to obtain a real image of a distant object. Since the object is very far away from the objective lens, the light emitted from the points on the object to the objective lens is almost parallel. Outside the focal point of the objective lens, an inverted, reduced real image is formed close to the focal point. This inverted, reduced real image is located within the focal point of the eyepiece, so the eyepiece functions as a magnifying glass. The eyepiece magnifies the inverted, reduced real image that has passed through the objective lens into an upright, magnified virtual image. This is a virtual image of a distant object through a telescope.

2. Magnifying glass: The magnifying glass is a convex lens. The distance from the magnifying glass to the object (object distance) is less than one focal length, which results in a magnified, upright virtual image.

3. Camera: The lens is a convex lens, the object distance is greater than twice the focal length, and it becomes an inverted, reduced real image.

4. Magnifying glass: The magnifying glass is a convex lens. The distance from the magnifying glass to the object (object distance) is less than one focal length, which results in a magnified, upright virtual image.

5. Projector: The lens is a convex lens. The object is inverted and enlarged into a real image between one and two focal lengths. The inverted image is inverted through a flat mirror, and the enlarged image is inverted once. It's a real image.

Note: For the camera and projector to make the image larger, the lens should be close to the object and away from the film and screen.

6. Microscope: The microscope is composed of an eyepiece and an objective lens. Both the objective lens and the eyepiece are convex lenses. They magnify the object twice. Ordinary optical microscope is based on the principle of convex lens imaging. The first time imaging through the objective lens (convex lens 1), the object at this time should be between one and two focal lengths of the objective lens (convex lens 1), and the resulting image should be a magnified inverted real image. Then, the object image obtained for the first time was used as the "object", and the image was passed through the eyepiece for the second time. Since we are observing on the other side of the eyepiece, the second image should be a virtual image, so that the image and the object are on the same side, so the first image should be on the eyepiece (convex lens 2). Within one focal length, after the second imaging, the second image is an enlarged upright virtual image.

Optical Ball Lenses

Optical Ball Lenses

7. Eye: The lens of the eye is equivalent to a convex lens, and the retina is equivalent to a light screen (film).

(1) The imaging principle of the eye: the light emitted from the object passes through a comprehensive convex lens such as the lens to form an inverted, reduced real image on the retina. The optic nerve cells distributed on the retina are stimulated by light and transmit this signal to the brain People can see this object (the lens of the eye is equivalent to a convex lens, and the retina is equivalent to a light screen (film)).

(2) Myopia can't see the distant objects clearly. The distant objects are imaged in front of the retina. The curvature of the lens is too large, and it needs to be adjusted by wearing a concave lens, so myopia is a concave lens.

(3) Hyperopia can't clearly see the near objects, the near objects are imaged behind the retina, the lens curvature is too small, and you need to wear a convex lens to adjust, so the hyperopia lens (flower mirror) is a convex lens.

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