The discussion centers on the equation "d=n[1-1/n]" related to glass blocks and the concept of displacement. Participants express confusion about how the distance of an object from the glass block affects the displacement value "d." It is clarified that the equation pertains to the refraction of light through the glass block, where "d" remains constant regardless of the object's distance. The focus is on understanding why the displacement does not vary with distance, emphasizing the principles of optics involved. Overall, the conversation seeks clarity on the relationship between distance, displacement, and the properties of glass blocks in optics.