Final answer:
Sunlight passes through three types of media when observed from a window: it travels from empty space, into Earth's atmosphere, and finally through the glass of the window as it reaches the observer's eyes.
Step-by-step explanation:
When observing a beautiful sunset from the window of your home, the pathway of the sunlight to Earth can be described as traversing through three types of media. (a) Initially, the sunlight travels through empty space: this is the void between celestial bodies where no atmosphere or material substance is present. (b) Upon entering the Earth's environment, sunlight then moves through the atmosphere, composed mainly of air. Finally, (c) if you are watching through a window, the light must pass through the glass before it reaches your eyes. In physics, we tend to model light as traveling in straight lines called rays. These rays can be altered in direction when encountering different media or reflective surfaces, but otherwise, they continue in a straight path.