Abstract: An optical lens, in order from an object side to an image-forming side, includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The object-side surface of the first lens has an effective diameter ?1. The image-side surface of the first lens has a curvature radius R2 and an effective radius D2. The object-side surface of the second lens has an effective diameter ?2. The optical lens satisfies at least one of the following conditions: 0.2??2/?1, ?2/?1?0.65, 0.65?D2/R2 and D2/R2?1.2.

Abstract: An optical lens, in order from an object side to an image-forming side, includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The object-side surface of the first lens has an effective diameter ?1. The image-side surface of the first lens has a curvature radius R2 and an effective radius D2. The object-side surface of the second lens has an effective diameter ?2. The optical lens satisfies at least one of the following conditions: 0.2??2/?1, ?2/?1?0.65, 0.65?D2/R2 and D2/R2?1.2.

Abstract: An optical lens is provided. The optical lens having an optical axis comprises, in order from an object side to an image-forming side, a first lens having negative refraction power, a second lens having positive refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power, a fifth lens having positive refraction power, and a sixth lens having refraction power. The sixth lens has an inflection point on a surface toward the image-forming side, the inflection point is separated from an optical axis by a distance h13, the radius of the sixth lens is H3, and |h13/H13|?0.55.

Abstract: An optical lens is provided. The optical lens having an optical axis comprises, in order from an object side to an image-forming side, a first lens having negative refraction power, a second lens having positive refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power, a fifth lens having positive refraction power, and a sixth lens having refraction power. The sixth lens has an inflection point on a surface toward the image-forming side, the inflection point is separated from an optical axis by a distance h13, the radius of the sixth lens is H3, and |h13/H13|?0.55.

Abstract: This invention provides an optical lens, which comprises, in order from an object side to an image-forming side, a first lens group having positive refractive power and a second lens group having negative refractive power. The first lens group includes: in order from the object side to the image-forming side, a first lens having refractive power and a second lens having refractive power. The second lens group includes: in order from the object side to the image-forming side, a third lens having refractive power and a fourth lens having refractive power, wherein the fourth lens has a concave surface toward the object side.