Lens and optical component

An optical component comprising:

• a lens having a circular shape when viewed in a plan view, and forming the outermost layer of the optical component;
• and
• a diamond like carbon film covering at least a portion of an entrance surface side of the lens,
• the lens is composed of zinc sulfide,
• the optical component allows infrared rays having a wavelength of 8 to 12 μm to pass therethrough,
• the lens is a diffractive lens,
• a surface of the diffractive lens has not more than 0.05 μm of an average value of surface roughnesses Ra in an optical effective area,
• the lens has a diffractive surface on an exit surface side, and the lens does not have the diffractive surface on the entrance surface side,
• the lens has a bending strength of not less than 10 MPa and not more than 300 MPa, and
• the following conditions (a), (b) and (c) are simultaneously satisfied:
• (a) lens diameter (mm)≤20×thickness (mm)−50,
• (b) the lens has a thickness of more than 3 mm and not more than 7.5 mm at a lens center, and
• (c) the lens has a lens diameter of not less than 5 mm and not more than 40 mm.