Optical lens

An optical lens comprising a first lens group, an aperture stop and a second lens group arranged in order from a magnified side to a minified side, the first lens group having at least one glass lens and at least one aspheric lens in order from the magnified side to the minified side, the second lens group having at least four lenses that includes at least one aspheric lens, the second lens group having a positive refractive power, a total number of lenses with refractive powers in the optical lens being smaller than nine, and the optical lens satisfying the following conditions:

• 1 mm<EFL<2 mm, D1<10 mm, LT<15 mm and 0.15<EFL/LT<0.25, where EFL is an effective focal length of the optical lens, D1 is a lens diameter of a lens of the optical lens closest to the magnified side, and LT is a distance between an optical center of a magnified-side surface of the lens closest to the magnified side and an optical center of a minified-side surface of the lens closest to the minified side.