University of Calcutta2026-09-302026-09-302026https://drive.google.com/file/d/1AhssO_7VF_yBl5n9CxvuWaEVx33ZZtbQ/view?usp=drive_linkhttp://ssm.ndl.gov.in/handle/123456789/2099(Waves and Optics)otherOther