Explore the fundamental concepts of photometry in this 30-minute Bengali video lecture from the Polytechnic Physics 2 (65922) course. Delve into Chapter 6, covering topics such as the inverse square law of light intensity, the relationship between luminous power and illuminance, basic principles of photometry, light sources and mediums, and the concept of light beams. Learn essential physics concepts aligned with the Bangladesh Technical Education Board (BTEB) curriculum for HSC and SSC levels.