Resolution of an imaging system means "the ability of the imaging system to distinguish different details in an image" or it is a measure of the frequency map or content (information displayed) in an image or smallest measurable information of the object that an imaging system can resolve. According to the Ernst Abbe's theory in 1873, resolution is the minimum separation between two closely placed objects such that they can be seen separated. High resolving detail images has been pursued by scientists for last two decades, because high resolution imaging system retrieves more detail from an image which are needed in many areas like in medical imaging, aerial images etc. The main objective of an optical imaging system is to image an object and to create the image as similar to the object as possible. Various techniques have been used for advancement in resolution of imaging devices but still there is a room for further enhancement in resolution.