Is there any specific requirement for a High Court judge designated as an ad hoc judge?
Yes, there is a specific requirement for a High Court judge designated as an ad hoc judge. According to the context provided in Article 127: "...request in writing the attendance at the sittings of the Court, as an ad hoc Judge, for such period as may be necessary, of a Judge of a High Court duly qualified for appointment as a Judge of the Supreme Court to be designated by the Chief Justice of India." The High Court judge must be "duly qualified for appointment as a Judge of the Supreme Court" in order to be designated as an ad hoc judge.