NOVELTY - The method comprises: applying and bonding (310) a first face of a glass sheet with a layer of a first material; applying (320) a second layer of material on a free face of the layer of the first material opposite to the glass sheet; shaping (330) a complex comprising the glass sheet coated with the first material layer and the second material layer to a final shape so that the glass sheet is mainly in compression compared to an initial shape; and bonding (340) the layer of the second material on the first material layer for dimensionally stabilizing a final shape.    USE - The method is useful for shaping a thick glass sheet of a mirror that is useful in a device for transforming a solar energy into a thermal or electrical energy (all claimed).    ADVANTAGE - The method is capable of simply and economically hardening the glass sheet without breaking the glass sheet and improving mechanical resistance of the glass sheet.    DETAILED DESCRIPTION - The method comprises: applying and bonding (310) a first face of a glass sheet with a layer of a first material adapted to be under tension, where the layer has a thickness such that a neutral line is formed in a section perpendicular to a plane of the glass sheet, a complex consisting of the glass sheet and the first material layer is located on a side remote from the layer of first material, and the glass sheet is in an initial form; applying (320) a second layer of material adapted to work in compression on a free face of the layer of the first material opposite to the glass sheet, where the second layer of material conforms to a shape of the face of the layer of first material; shaping (330) the complex comprising the glass sheet coated with the first material layer and the second material layer to a final shape so that the glass sheet is mainly in compression compared to the initial shape; and bonding (340) the layer of the second material on the first material layer for dimensionally stabilizing the final shape. The method further comprises: positioning a mold of the glass sheet coated with the first material layer on the first face, where a second face of the glass sheet, opposite to the first face, is directed toward a mold cavity having a desired shape for the glass sheet; and shaping the glass sheet on the mold in which the glass sheet is brought in contact with a matrix to form a shape. The glass sheet is maintained in contact with the matrix during the step of adherence of the layer of second material on the layer of first material and the step of dimensional stabilization. The step of application and adherence to the first face of the glass sheet is carried out by maintaining the glass sheet approximately planar with the first concave face. The layer of the first material consists of a composite material including of mineral or organic fibers that is directional or non-directional and woven or non woven, and a hard resin. The step of application and adherence to the first face of the glass sheet of the layer of first material realized by the application of impregnated fibers of a resin is not hardened followed by a step of hardening the resin during which the layer of the first material is maintained in contact with the glass sheet by the application of a pressure. The mold is below the glass sheet. The layer of the second material consists of a composite material including of mineral or organic fibers that is directional or non-directional and woven or non woven, and a hard resin. The step of adherence of the layer of second material on the layer of first material is obtained by hardening the resin compressed and hardened in contact with the glass sheet. The shape of the matrix of the mold is plane or convex so as to give a plane or concave form to the second surface of the glass sheet. INDEPENDENT CLAIMS are included for:    (1) a mirror; and    (2) a device for transforming a solar energy into a thermal or electrical energy.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of a method for shaping a thick glass sheet (Drawing includes non-English language text).    Applying and bonding a first face of a glass sheet with a layer of a first material (310)    Applying a second layer of material on a free face of the layer of the first material opposite to the glass sheet (320)    Shaping a complex (330)    Bonding the layer of the second material on the first material layer for dimensionally stabilizing the final shape. (340)