{"knowledge_schema": {"broad_category": "Physics \u2192 Optics \u2192 Refraction", "refinement": "This problem involves understanding the behavior of light as it travels through a medium with a specific index of refraction while the medium itself is in motion.", "specific_scope": "The focus is on determining the speed of light in a moving medium as observed from a stationary laboratory frame, taking into account the effects of the medium's motion on the perceived speed of light.", "goal": "Calculate the speed of light in the medium relative to an observer in the laboratory frame, considering the index of refraction and the velocity of the medium."}, "summary": "This problem pertains to the field of optics, specifically the behavior of light in a medium with a given index of refraction while the medium is in motion. The task is to find the speed of light as observed from a laboratory frame when the medium is moving toward the observer. The correct answer is derived from the principles of refraction and the effects of motion on the speed of light, leading to the conclusion that the speed of light in the medium relative to the observer is 1/n."}