Camera optical lens

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

• a first lens, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens;
• wherein the second lens has a convex object side surface and a concave image side surface;
• wherein the camera optical lens further satisfies the following conditions:
• 0.5≤f1/f≤10;
• 1.7≤n1≤2.2;
• 1.7≤n6≤2.2;
• 0.02≤d1/TTL≤0.07;
• 0.84≤f2/f≤2.82;
• −2.54≤(R3+R4)/(R3−R4)≤−0.8;
• 0.06≤d3/TTL≤0.19;
• where f:
• the focal length of the camera optical lens;
• f1:
• the focal length of the first lens;
• f2:
• the focal length of the second lens;
• n1:
• the refractive power of the first lens;
• n6:
• the refractive power of the sixth lens;
• d1:
• the thickness on-axis of the first lens;
• TTL:
• optical length;
• R3:
• the curvature radius of the object side surface of the second lens;
• R4:
• the curvature radius of the image side surface of the second lens;
• d3:
• the thickness on-axis of the second lens.