Camera optical lens

A camera optical lens, comprising, from an object side to an image side:

• a first lens having a positive refractive power;
• a second lens having a negative refractive power;
• a third lens having a positive refractive power;
• and
• a fourth lens having a negative refractive power,
• wherein the camera optical lens satisfies following conditions:
• 0.10≤R1/R2≤0.20;
• 1.10≤R3/R4≤1.50;
• 5.50≤R5/R6≤6.50;
• and
• −6.50≤f2/f≤−4.50,
• where
• f denotes a focal length of the camera optical lens;
• f2 denotes a focal length of the second lens;
• R1 denotes a curvature radius of an object side surface of the first lens;
• R2 denotes a curvature radius of an image side surface of the first lens;
• R3 denotes a curvature radius of an object side surface of the second lens;
• R4 denotes a curvature radius of an image side surface of the second lens;
• R5 denotes a curvature radius of an object side surface of the third lens;
• and
• R6 denotes a curvature radius of an image side surface of the third lens.