A lenses assembly includes a first lens, a second lens, and adhesive material. The first lens includes two axially extending protrusions. The second lens includes two radially extending protrusions. The second lens engages with the first lens by engagement between the axially extending protrusions and radially extending protrusions. The axially extending protrusions and radially extending protrusions are alternately arranged around a circumferential direction of the first lens. The adhesive material is filled into gaps between the engaged protrusions to fixedly interconnect the first lens and the second lens.