1. Use of Multimode Optical Fibre in Mine Communication—A Case Study

   • T. Bandyopadhyay
   • K. Dasgupta
   • P. Saha

   OriginalPaper 01 June 1991 Pages: 55 - 70

2. Number of Photons and the Entropy of a Beam

   • S. Gupta
   • S. P. S. Virdi

   OriginalPaper 01 June 1991 Pages: 71 - 72

3. On the Resolving Power of a Grating

   • R. S. Sirohi

   Tutorial Note 01 June 1990 Pages: 73 - 73

4. Focusing Objective for Lasser Maching

   • P. Nageswara Rao

   Apparatus Note 01 June 1990 Pages: 74 - 75