Methods for Optical Calibration of the BigBite Hadron Spectrometer M. Mihovilovic, K. Allada, B.D. Anderson, J.R.M. Annand, T. Averett, A. Camsonne, R.W. Chan, J.-P. Chen, K. Chirapatpimol, C.W. de Jager, S. Gilad, D.J. Hamilton, J.-O. Hansen, D.W. Higinbotham, J. Juang, X. Jiang, G. Jin, W. Korsch, J.J. LeRose, R.A. Lindgren, N. Liyanage, E. Long, R. Michaels, B. Moffit, P. Monaghan, V. Nelyubin, B.E. Norum, E. Piasetzky, X. Qian, Y. Qiang, S. Riordan, G. Ron, G. Rosner, B. Sawatzky, M. Shabestari, A. Shahinyan, R. Shneor, S. Sirca, R. Subedi, V. Sulkosky, J.W. Watson, B. Wojtsekhowski, Y.-W. Zhang