{"knowledge_schema": {"broad_category": "Physics \u2192 Optics \u2192 Relativity", "refinement": "This problem involves the behavior of light as it travels through a medium (glass) that is in motion relative to an observer.", "specific_scope": "The focus is on determining the speed of light in a moving medium (glass) as observed from a stationary laboratory frame, considering the effects of the medium's index of refraction and its velocity.", "goal": "Calculate the speed of light in the moving glass relative to the observer in the laboratory frame."}, "summary": "This problem examines how the speed of light changes when it propagates through a moving medium, specifically glass, as observed from a stationary frame. The task is to apply the principles of optics and relativity to derive the speed of light in the moving glass relative to an observer in the laboratory. The goal is to find the correct expression for this speed, considering the index of refraction and the velocity of the glass."}