Magnifying Ruler Bookmark

Item Number:19070774
Product Name:Magnifying Ruler Bookmark
Product Color/Logo:See Photos or Customized
Product Material:PVC
Net Weight:4g
Product Size:190x65mm
Payment:T/T,Paypal,West Union
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Product Details

High Quality Product Ruler Book Mark Magnifier Ruler Card Magnifier in Plastic                

Specifications                

Product Name:                

Magnifying Ruler Bookmark

Product Color/Logo                

See Photos or Customized

Product Material                

PVC

Net Weight                

4g

Product Size                

190x65mm

Payment:                

T/T,Paypal,West Union

Magnifying Ruler Bookmark Fresnel lenses are made of PVC material according to the principle invented by French photophysicist FRESNEL. The surface of the lens (0.45-0.5mm thick) is burned in concentric circles from small to large and outwards from shallow to deep, which looks jagged from the cross section. There are many circular lines and dense sensing angles, and the focal length is long; the deep induction distance of the circular line recording is long and the focal length is close. Several concentric rings in the same row form a vertical sensing area, and a horizontal sensing segment is formed between the concentric rings. The more the vertical sensing area, the greater the vertical sensing angle; the longer the lens, the more the sensing section, the greater the horizontal sensing angle.

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