Thesis Title: Improvement of Magnifier
Speaking of magnifying glasses, everyone must be very familiar with them. Magnifier is a simple visual optical device used to observe the details of objects. It is a convergent lens with a focal length far less than the apparent distance of the eyes. The size of the object imaged on the human retina is directly proportional to the viewing angle of the object to the eye. The larger the viewing angle, the larger the image, and the more you can distinguish the details of the object. Moving closer to the object can increase the viewing angle, but it is limited by the focusing ability of the eyes. Use a magnifying glass, make it close to the eyes, and put the object in its focus to form an upright virtual image. Magnifier plays a role in expanding the viewing angle.
As early as thousands of years ago, people have ground transparent crystals or transparent gems into "lenses", which can enlarge images. Also becomes a convex lens.
Magnifier is mainly composed of solid lens handle and visual lens, glass-a transparent solid substance. Widely used in buildings, it is wind-proof and light-permeable, belonging to a mixture and cannot be recycled. This paper is about glass.
As we all know, the visibility lenses used in magnifying glasses are generally made of glass. Glass is not only expensive, but also waste glass, as one of the difficult problems of environmental protection departments all over the world, is solid waste and a threat to human beings. It is inevitable that there will be waste glass when making a magnifying glass, and those waste glass cannot be recycled. I think this is a great waste. Why not think in another direction: replace glass with another material-smooth and transparent thin plastic.
Plastic-recyclable, low cost and affordable.
Some people will say that replacing glass with plastic will hinder the use of magnifying glasses and achieve the opposite effect. Although this saves materials, it greatly changes the use of the magnifying glass itself.
But I'm not finished yet: although replacing glass with smooth plastic will change the use of magnifying glass, I also came up with a countermeasure-filling the interlayer between two lenses with water can play the role of magnifying glass, so-I had this bold idea.
This idea stems from a small discovery in my life.
I remember it was in summer. It's hot and unbearably hot. Many students like to buy imported mineral water, and I am no exception. The shape of the bottle is different from that of Master Kong mineral water, with uneven patterns. Completely as flat as a medical infusion bottle. Through the water bottle, you can see the nutrient composition table above, and the font is big and clear. You can also see your fingerprints clearly when you pinch them on a water bottle. When water is poured out, everything you see is normal. Why? I did a simple experiment: Group A: Cut a part of the same mineral water bottle, then drop a drop of water into it, and put a newspaper under it to see if the font of the newspaper has changed and is clear. Group B: Cut a part of the same mineral water bottle and put it directly in the newspaper to see if the font has changed. But the result is that the font of group A is indeed enlarged, but it is not very clear because water is liquid. The font of group b has not changed. I'm thinking: if the water doesn't sway, can the font of the newspaper be seen more clearly? Do as you say. I took out a zero. 5 cm high square solid sealed transparent mold, filled with water, covered with a lid. Sure enough, the water didn't shake. Put the mold on the newspaper, and the font of the newspaper is not only enlarged, but also very clear.
To sum up, it shows that it is feasible to use plastic instead of glass as the visible lens of magnifying glass, and I believe this idea can be realized in the near future.
The topic of this article ends here! Thank you all.