Optical lens

An optical lens, comprising a total of six lenses, wherein from an object side to an imaging plane along an optical axis of the optical lens, the optical lens sequentially comprises:

• a first lens with a negative focal power, an object side surface of the first lens being convex, and an image side surface of the first lens being concave;
• a second lens with a positive focal power, an object side surface of the second lens being concave, and an image side surface of the second lens being convex;
• a stop;
• a third lens with a positive focal power, both an object side surface and an image side surface of the third lens being convex;
• a fourth lens with a positive focal power, both an object side surface and an image side surface of the fourth lens being convex;
• a fifth lens with a negative focal power, both an object side surface and an image side surface of the fifth lens being concave;
• and
• a sixth lens with a positive focal power, an object side surface of the sixth lens being convex, and an image side surface of the sixth lens being concave;
• wherein the fourth lens and the fifth lens are cemented to form a cemented lens;
• an effective focal length f of the optical lens and a true image height IH corresponding to a maximum field of view meets an expression:
• 0.6<f/IH<0.7;
• and
• an effective aperture HD1 of the object side surface of the first lens corresponding to a half field of view of the optical lens and an effective aperture D1 of the object side surface of the first lens meet an expression:
• 0.55<HD1/D1<0.65.