Explanation:

According to Sec 48. Variation of shareholders’ rights
(1) Where a share capital of the company is divided into different classes of shares, the rights attached to the shares of any class may be varied with the consent in writing of the holders of not less than three-fourths of the issued shares of that class or by means of a special resolution passed at a separate meeting of the holders of the issued
shares of that class,—
(a) if provision with respect to such variation is contained in the memorandum or articles of the company; or
(b) in the absence of any such provision in the memorandum or articles, if such variation is not prohibited by the terms of issue of the shares of that class:
Provided that if variation by one class of shareholders affects the rights of any other class of shareholders, the consent of three-fourths of such other class of shareholders shall
also be obtained and the provisions of this section shall apply to such variation.
(2) Where the holders of not less than ten per cent. of the issued shares of a class did not consent to such variation or vote in favour of the special resolution for the variation,
they may apply to the Tribunal to have the variation cancelled, and where any such application is made, the variation shall not have effect unless and until it is confirmed by the Tribunal:
Provided that an application under this section shall be made within twenty-one days after the date on which the consent was given or the resolution was passed, as the case may be, and may be made on behalf of the shareholders entitled to make the application by such one or more of their number as they may appoint in writing for the purpose.
(3) The decision of the Tribunal on any application under sub-section (2) shall be binding on the shareholders.
(4) The company shall, within thirty days of the date of the order of the Tribunal, file a copy thereof with the Registrar.
(5) Where any default is made in complying with the provisions of this section, the company shall be punishable with fine which shall not be less than twenty-five thousand rupees but which may extend to five lakh rupees and every officer of the company who is in default shall be punishable with imprisonment for a term which may extend to six months or with fine which shall not be less than twenty-five thousand rupees but which may extend to five lakh rupees, or with both.