Lens

A lens comprising:

• a filter, a light shielding material layer, and a lens set sequentially arranged along a first direction, wherein the filter comprises:
• a first material layer substantially composed of a material having a refractive index of N1, the material of the first material layer being substantially transparent to a visible light and an infrared light;
• and
• a second material layer surrounding at least one portion of the first material layer and substantially composed of a material having a refractive index of N2, the material of the second material layer being substantially opaque to the visible light and substantially transparent to the infrared light, wherein N1/N2 is smaller than or equal to 1.05, and the first material layer is connected to the second material layer through a ring-shaped interface tapered in an outward manner along the first direction.