Apparatus comprising: an optical structure; at least two ridges (14; 14a-p), each connecting the optical structure to a supporting structure, wherein the ridges (14; 14a-p) are implemented to effect, by heating the ridges (14; 14a-p), deformation of the ridges (14; 14a-p) and a movement of the optical structure with regard to a reference plane; wherein the at least two ridges (14; 14a-p) include a first layer (34a; 34b) and a second layer (36a; 36b) that are deflectable differently in relation to one another; wherein the optical structure includes a layer, wherein the layer of the optical structure and the first layer (34a; 34b) of the ridges (14; 14a-p) are formed of the same material; wherein the optical structure includes a further layer, wherein the further layer of the optical structure and the second layer (36a; 36b) of the ridges (14; 14a-p) are formed of the same material; wherein the layer of the optical structure and the first layer (34a; 34b) of the ridges (14; 14a-p) are integrated and the further layer of the optical structure and the second layer (36a; 36b) of the ridges (14; 14a-p) are integrated; wherein the supporting structure includes a portion of the ridge material, wherein the first layer (34a; 34b) and the second layer (36a; 36b) include different coefficients of thermal expansion, and characterized in that the ridges (14; 14a-p) are configured such that, caused by a different expansion of the materials of the ridges (14; 14a-p), the movement of the optical structure with regard to a reference plane counteracts a thermally induced change of an optical characteristic of the optical structure. an optical structure; at least two ridges (14; 14a-p), each connecting the optical structure to a supporting structure, wherein the ridges (14; 14a-p) are implemented to effect, by heating the ridges (14; 14a-p), deformation of the ridges (14; 14a-p) and a movement of the optical structure with regard to a reference plane; wherein the at least two ridges (14; 14a-p) include a first layer (34a; 34b) and a second layer (36a; 36b) that are deflectable differently in relation to one another; wherein the optical structure includes a layer, wherein the layer of the optical structure and the first layer (34a; 34b) of the ridges (14; 14a-p) are formed of the same material; wherein the optical structure includes a further layer, wherein the further layer of the optical structure and the second layer (36a; 36b) of the ridges (14; 14a-p) are formed of the same material; wherein the layer of the optical structure and the first layer (34a; 34b) of the ridges (14; 14a-p) are integrated and the further layer of the optical structure and the second layer (36a; 36b) of the ridges (14; 14a-p) are integrated; wherein the supporting structure includes a portion of the ridge material, wherein the first layer (34a; 34b) and the second layer (36a; 36b) include different coefficients of thermal expansion, and characterized in that the ridges (14; 14a-p) are configured such that, caused by a different expansion of the materials of the ridges (14; 14a-p), the movement of the optical structure with regard to a reference plane counteracts a thermally induced change of an optical characteristic of the optical structure.