Light travels in:

**The reasoning** Light travels in **straight lines** through a uniform medium — this is called **rectilinear propagation of light**. That's why: - Shadows have sharp edges (light can't bend around objects to fill them in) - You can't see around corners without a mirror - A laser pointer makes a perfectly straight beam - We use rulers to draw "lines of sight" in ray diagrams This straight-line motion continues until light hits a boundary (like glass or water), where it may reflect or refract, but even then, it travels in *new* straight lines, not curves. **Why the wrong options tempt you** - **A (Curves)**: You might think of light "bending" during refraction, but that's actually light changing direction *sharply* at the boundary between media, then continuing straight in the new direction. - **C (Circles) & D (Spirals)**: These sound scientific but have no basis. Light doesn't orbit or spiral naturally in normal conditions. **Quick takeaway** Light is the ultimate "straight shooter" — it only travels in straight lines unless something forces it to change direction, which is why shadows exist and you need mirrors to see around corners.