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2023
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07
How to distinguish between glass convex lenses and plastic convex lenses
1. The weight is different, and glass is much heavier.
2. Unlike the collision sound of metal objects, the sound of glass should be loud and clear.
Touch method (the thin edge in the middle is a concave lens, and the thick edge in the middle is a convex lens).
2. Focusing method (when parallel light is emitted, a convex lens converges and a concave lens diverges).
3. Enlargement method (place the lens on the character, and see if the character is enlarged to be a convex lens or reduced to be a concave lens).
4. Shake method (place the lens on the character and move it to one side. The direction of the character is the same as the direction of the lens movement, which is a concave lens, while the opposite is a convex lens).
The magnification of a convex lens (virtual image, which is a positive image) is only related to the focal length of the lens, and the virtual image and object are on the same side of the lens.
The calculation formula is: apparent distance (25CM)/focal length=magnification.
The shorter the focal length, the higher the magnification.
The imaging magnification (real image, inverted image) of a convex lens is related to the image distance, and the real image and object are on both sides of the lens.
Its imaging formula: 1/focal length=1/object distance+1/image distance
The closer the object is to the focal point, the larger the image distance and the larger the image. The magnification of this real image is not limited by the lens focal length.
The surface of a convex lens is curved, which is a part of a circle and can measure the radius of the arc. This radius is called the curvature radius of the lens arc. It is obvious that the smaller the curvature radius, the higher the protrusion in the middle of the lens, the greater the thickness of the lens, and the shorter the focal length of the lens.
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