Optical lenses are usually optical components made of glass or plastic with a spherical surface, mainly used for the aggregation and dispersion of light, optical imaging, and other fields. There are many types of optical lenses, and their functions are different. They mainly include biconvex lens, biconvex lens, planoconvex lens, planoconvex lens, double glued Achromatic lens, meniscus lens, cylindrical lens, etc. Today we will mainly learn about the imaging law of planoconvex lens?
(1) A conjugate imaging condition that a convex lens needs to meet to form a real image.
(2) Conjugate imaging refers to the interchangeable size of object distance and image distance, in which the inverted real image is enlarged or reduced, respectively
Like looking at a clock beyond twice the focal length through a convex lens, the image of the second hand still rotates clockwise, because this Aspheric lens is an inverted real image, which is still the normal direction when viewed upside down, so it still rotates clockwise.
Lenses are represented by lens symbols (with two V-shaped markings at both ends of a line segment), the main optical axis is drawn, and the optical center and focal point are marked. Based on the two refracted rays of the three special rays of the lens, the intersection point between the ray passing through the optical center and the ray parallel to the main optical axis is generally used to obtain the characteristics of the lens's imaging (such as virtual reality, size, forward and backward).
When imaging with a lens, all the light emitted from each point on the object that illuminates the lens is imaged at the same position, blocking a portion and not affecting the imaging of other light rays directed towards the lens. Therefore, the complete image can still be seen. However, due to the decrease in light emitted from the image, the brightness of the screen image will decrease.