An optical lens having, in total, six lenses which sequentially comprise from an object side to an imaging surface (S15) along an
optical axis: a first lens (L1) having a negative focal power, an object-side surface (S1) thereof being a convex surface, and an image-side surface (S2) thereof being a
concave surface; a second lens (L2) having a positive focal power, an object-side surface (S3) and an image-side surface (S4) thereof both being convex surfaces; a third lens (L3) having a positive focal power, an object-side surface (S5) thereof being a convex surface, and an image-side surface (S6) thereof being a
concave surface; and a fourth lens (L4) having a negative focal power, an object-side surface (S7) and an image-side surface (S8) thereof both being concave surfaces; a fifth lens (L5) having a positive focal power, an object-side surface (S9) and an image-side surface (S10) thereof both being convex surfaces; and a sixth lens (L6) having a negative focal power, an object-side surface (S11) thereof being a convex surface, and an image-side surface (S12) being a
concave surface. An effective
focal length f of the optical lens and the
radius of curvature R6 of the image-side surface of the third lens (L3) satisfy: R6 / f>14.0. By means of the reasonable configuration of
surface type of each lens and the reasonable focal-power combination in the optical lens, the resolution of the optical lens is improved, and the aberration is reduced, thus improving the
imaging quality of the optical lens.