Camera optical lens

A camera optical lens comprising five-piece lenses, from an object side to an image side, the five-piece lenses are:

• a first lens having a positive refractive power;
• a second lens having a negative refractive power;
• a third lens having a negative refractive power;
• a fourth lens having a positive refractive power;
• and
• a fifth lens having a negative refractive power;
• wherein the camera optical lens satisfies following conditions:
• −3.50≤f2/f1≤−1.80;
• 1.00≤(R7+R8)/(R7−R8)≤1.75;
• 1.30≤d6/d4≤2.00;
• 5.00≤(R5+R6)/(R5−R6)≤20.00;
• and
• −5 .00≤R9/R10≤−1.50;
• where
• f1 denotes a focal length of the first lens;
• f2 denotes a focal length of the second lens;
• R5 denotes a curvature radius of an object-side surface of the third lens;
• R6 denotes a curvature radius of an image-side surface of the third lens;
• R7 denotes a curvature radius of an object-side surface of the fourth lens;
• R8 denotes a curvature radius of an image-side surface of the fourth lens;
• R9 denotes a curvature radius of an object-side surface of the fifth lens;
• R10 denotes a curvature radius of an image-side surface of the fifth lens;
• d4 denotes an on-axis distance from an image-side surface of the second lens to the object-side surface of the third lens;
• and
• d6 denotes an on-axis distance from the image-side surface of the third lens to the object-side surface of the fourth lens.