4-PS4-2
The standard
Develop a model to describe that light reflecting from objects and entering the eye allows objects to be seen.
Next Generation Science Standards
What this standard means
Students need to show, with a simple model, how seeing happens. Light starts at a source, hits an object, bounces off it, and then enters the eye. They should use arrows to show the path of light and explain why an object cannot be seen without light reaching the eye.
Mastery looks like a labeled diagram, a physical model, or a clear spoken explanation that connects light source, object, reflection, and eye. Students often think eyes send out light, or that light only shines on objects without bouncing. They may also forget that the eye must be in the light’s path.
Ways to teach it
- Use flashlights, mirrors, toy objects, and paper eyes to build a tabletop model showing light bouncing from object to eye.
- Ask students to write: Why can you see a book in sunlight but not in a dark closet?
- Show three diagrams and have students circle the one that correctly shows light traveling from source to object to eye.
- Connect to bike reflectors by asking how headlights help a driver see the reflector at night.
Plan a lesson for 4-PS4-2
Generate a complete lesson plan aligned to this standard, with objectives, activities, and materials. Free, no account needed.
Related standards
- MS-PS4-2
Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.
- 5-PS1-1
Develop a model to describe that matter is made of particles too small to be seen.
- 1-PS4-2
Make observations to construct an evidence-based account that objects can be seen only when illuminated.
- 4-PS4-1
Develop a model of waves to describe patterns in terms of amplitude and wavelength and that waves can cause objects to move.