Light Follows a Straight Path
Light Follows a Straight Path is a Grade 4 science skill from Amplify Science (California), Chapter 2 on how light allows a Tokay gecko to see prey. Students learn that light always travels in a straight line from its source — it cannot curve or bend around corners — which is why opaque objects cast shadows and why light can be blocked by obstacles.
Key Concepts
The movement of light follows a strict physical rule: it travels in a straight line . Light cannot curve, bend around corners, or wander randomly. It moves directly away from its source until it strikes an object.
This property is crucial for understanding vision because it means that if an opaque object blocks the straight path of light, a shadow is formed, and the light cannot reach anything behind that obstacle.
Common Questions
Why does light travel in a straight line?
Light is a form of electromagnetic radiation that propagates in straight lines unless it passes through a different medium or strikes an object. This property is fundamental to how vision and shadows work.
Can light bend around corners?
No. Light travels strictly in straight lines and cannot bend around corners or curved surfaces on its own. It can only change direction if it is reflected or refracted.
How does light traveling in straight lines explain shadows?
Because light cannot curve around objects, any opaque object in the path of light blocks it completely, creating a shadow — a dark region where no light reaches.
Where is this in Amplify Science Grade 4?
It is in Chapter 2: How does light allow a Tokay gecko to see its prey? in Amplify Science (California), Grade 4.