Convex Lens Window Bag / Theorems of Physics and Optics

刺绣 Embroidery order production takes time and will be completed within 30 days after payment is completed. 尺寸 Size description Coin wallet: about 13 x 10cm Pencil case: approx. 19 x 9cm 凸 Convex lens: made according to the principle of light refraction. The convex lens is a lens with a thick center and a thinner edge. The convex lens is divided into a form of double convex, flat convex and concave (or positive meniscus). The convex lens has the function of collecting light, so it is also called converging lens. The thick convex lens has the function of telephoto and convergence, which is related to the thickness of the lens. . Bags can choose different colors~ The color of the inner cloth will be the same. If you want to customize the pattern or size, please email me! Full hand production https://c1.staticflickr.com/5/4902/46011574001_2c2667652f_b.jpg / / https://c1.staticflickr.com/5/4890/45100069285_44d3b4a82c_b.jpg Each one also used 100% of the effort to make it.