Khagol Bulletin # 131

The IUCAA family condoles the passing of Professor Deepak B. Vaidya, a senior physicist and an IUCAA Associate, on 23 December 2023. Professor Vaidya was a faculty member at the Department of Physics, Gujarat University, Ahmedabad, during the 1970s and 80s and was also part of the research group interested in light scattering effects of colloidal liquids. He was keenly involved in the infrared group at the Physical Research Laboratory, and he participated in several research activities undertaken by Professor J.N. Desai, including Comet Halley's observations. He worked on the modelling of dust in astrophysical environments such as the interstellar medium, comets, laboratory studies of light scattering, etc. He actively participated in several national and international meetings and workshops on interstellar dust and its modeling where all electromagnetic bands fromUV, Optical and IRwere covered. An Associate during 1992 to 1998, Professor Vaidya was a frequent visitor to IUCAA for over three decades and strongly collaborated with Professor Ranjan Gupta and international collaborators from USA, UK, Germany, Russia and Japan. Professor Vaidyawill bemissed. Professor Deepak B. Vaidya Obituary | 19 | KHAG L | No. 131 - JANUARY 2024