The Function of Optical Mirror and the Rule of Imaging

Ⅰ. The role of optical mirror


An optical lens is a visual element made of transparent materials (such as glass, crystal, etc.), which will affect the curvature of the wavefront of light. It is a device that can converge or disperse light, and the resulting images have real and virtual images. It is widely used in various fields such as security, car loans, digital cameras, lasers, and optical instruments.


Optical lenses include various common colorless optical glasses made of fused silica, calcium fluoride, magnesium fluoride, silicon, germanium, zinc selenide, and other materials. It includes plano-convex lenses, bi-convex lenses, plano-concave lenses, and bi-concave lenses of various wavelengths, super hemispherical lenses, small spherical lenses, and meniscus lenses, cylindrical lenses, rod lens, cemented lenses, etc.


Ⅱ. The law of optical mirror imaging


1. The lens is represented by a lens symbol (a line segment has two V-shaped signs at both ends), draw the central optical axis, and mark the optical center and focus. According to the intersection of the two refracted rays of the three special rays of the lens (generally the rays passing through the optical center and the rays parallel to the main optical axis are better), the characteristics of the image formed by the lens (such as virtual and solid image, size, forward and backward, etc.).


2. When the cylindrical optical lens is imaging, all the light emitted by each point on the object hits the lens and is imaged at the same position. Blocking a part does not affect the imaging of other light rays to the lens, so you can still see intact. However, the image's brightness on the screen will become darker due to the decrease of the light incident on the image.


3. Looking at a clock outside of the double focal length through a convex lens, the image of the second hand still rotates clockwise because it is an inverted actual image at this time, and it is still the average direction when viewed backward, so it still rotates clockwise.


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