1 EXHIBIT 2.1 AMENDMENT NO. 3 TO AGREEMENT AND PLAN OF MERGER This Amendment No. 3 (the "Amendment"), dated as of May 26, 2000, is entered into by and among Photronics, Inc., a Connecticut corporation ("Parent"), AL Acquisition Corp., a California...Agreement and Plan of Merger • May 31st, 2000 • Align Rite International Inc • Glass & glassware, pressed or blown • California
