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                                    upper half and lower half of a thin convex lens are having focal length f and 2f. a point object O is on the principal axis at a large distance from lens as shown in the figure. number of images formed by the lens on the principal axis is | 
                            
| Answer» upper half and lower half of a thin convex lens are having focal length f and 2f. a point object O is on the principal axis at a large distance from lens as shown in the figure. number of images formed by the lens on the principal axis is | |