Relationship Between Magnifying Glass Magnification X and D?

Relationship Between Magnifying Glass Magnification X and D?

Most of the material for magnifier and magnifier light are glass and acrylic

The characteristics of the glass:

1.     Wear-resistant: high hardness, not easy scratching surface, protect mirror clear for long-time

2.     High light transmittance: It is not easy to contaminate the dust and inspect the object more clearly.

3.     Low glare: Will not feel fatigue, not easy to feel dizziness when you use it for long-time.

Acrylic Features:

1.         Light weight: Only half the weight of ordinary glass.

2.         Impact Resistance: Tensile and impact-resistant ability than ordinary glass 7~18 times higher.

3.         High light transmittance: High transmittance, similar to glass translucent

Magnification of Magnifier and magnifying glass lamp:

Ø  Refractive brightness (D): Is the most commonly used measurement of optical magnification units, each 1D of refractive brightness of the object is magnified 25%.

Ø  Magnification (X): Is the magnification of the measured object, each 1X magnification means that the object is magnified by 100%.

Ø  Focal length: The distance from the lens to the focus of the light.

Refractive brightness	Greater than object (%)	Magnification (X)	Focal length mm (in)
1D	25%	1.25X	1016(40.00”)
2D	50%	1.5X	508(20.00”)
3D	75%	1.75X	339(13.33”)
4D	100%	2.00X	254(10.00”)
5D	125%	2.25X	203(8.00’”)
6D	150%	2.50X	169(6.67”)
7D	175%	2.75X	145(5.71”)
8D	200%	3.00X	127(5.00”)
9D	225%	3.25X	113(4.44”)
10D	250%	3.50X	102(4.00”)
12D	300%	4.00X	82(3.33”)
20D	500%	6.00X	51(2.00”)
28D	700%	8.00X	36(1.43”)
30D	750%	8.50X	34(1.33”)

The larger the center thickness of the magnifying glass, the larger the magnification, the smaller the field of vision, the center thickness of the magnifying glass, the smaller magnification, the larger the vision.

In generally, the larger the multiple, the smaller the field of vision. The larger the multiple, the more you should close to the lens.

The elderly read the newspaper, certainly need a slightly larger view, if the view is small, it will become only a word to see. However, the magnification is large, the field of vision is certainly relatively small. Therefore, the choice of the elderly magnifying glass, or reading magnifier, is not a multiple of the larger the better, is better to combine the size of the field of vision