90. (1) If at any time there should not be a quorum of the Judges of the Supreme Court available to hold or continue any session of the court, owing to a vacancy or vacancies, or to the absence through illness or on leave or in the discharge of other duties assigned by statute or otherwise, or the disqualification of a judge or judges, or if by reason of any temporary increase in the business of the Supreme Court the strength of the judges of the court should for the time being be increased, the Chief Justice, or in his absence the senior puisne judge may in writing request 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 to be designated in writing by the Chief Justice or in his absence by any acting Chief Justice or the senior puisne judge of such High Court upon such request being made to him in writing.

(2) It shall be the duty of the judge, who has been so designated, in priority to other duties of his office to attend the Sittings of the Supreme Court at the time and for the period for which his attendance shall be required, and while so attending he shall possess the powers and privileges and shall discharge the duties of a puisne judge of Supreme Court.