Lens, light source module, and lighting device

A lens, comprising a bottom surface, an inner surface, an outer surface, and a first receiving chamber;

• the first receiving chamber being configured to receive a light-emitting component, a wall surface of the first receiving chamber being the inner surface of the lens, wherein:
• the lens is in an axially symmetric structure and the lens has a main portion formed by stretching along a longitudinal direction;
• the inner surface comprises one first light-incident surface and two second light-incident surfaces, the two second light-incident surfaces are opposite to each other and are adjacent to the first light-incident surface;
• the first light-incident surface is a curved surface or a planar surface, each of the two second light-incident surfaces is a curved surface protruding toward a direction away from the first receiving chamber;
• and the first receiving chamber is defined by the first light-incident surface and the second light-incident surfaces;
• the bottom surface is a surface adjacent to the second light-incident surface;
• the outer surface comprises two first reflective surfaces, two first light-exiting surfaces, and two second light-exiting surfaces;
• the two first reflective surfaces are located in a middle top region and are intersected with each other;
• the two first light-exiting surfaces are located at both sides of the two first reflective surfaces;
• each of the two first light-exiting surfaces is intersected with one of the first reflective surfaces;
• and the two second light-exiting surfaces are adjacent to the first light-exiting surfaces;
• and
• the two first reflective surfaces form a V-shaped structure, and each of the second light-exiting surfaces is a curved surface protruding toward a direction away from the first receiving chamber.