A comprehensive Grade 4 substitute teaching unit reviewing Amplify Science's Vision and Light concepts, including light reflection, parts of the eye, and the path of light carrying visual information to the brain.
A nocturnal Tokay gecko is hunting a cricket in the rainforest at dusk. A lantern provides light. On the diagram below, draw straight light rays with arrows showing the complete path light takes so the gecko can see the cricket.
Model Canvas: Draw light rays and arrowheads Remember: Light travels in straight lines!
Light Source (Lantern)
Object (Cricket)
Gecko's Eye & Brain
Step-by-Step Path Explanation:
Step 1: From the light source to the cricket:
Step 2: What happens when light strikes the cricket?
Step 3: What does the gecko's eye and brain do once light enters the pupil?
Scientific Explanation: Complete the Claim
If a thick wooden plank is placed between the cricket and the gecko's eyes, can the gecko still see the cricket? Explain why using the concept of light paths:
How does light travel through empty space or clear air?
Answer: In straight lines.
CARD 3
What scientific word means light bouncing off an object?
Answer: Reflection (reflect).
CARD 4
What is the clear, protective outer window of the eye called?
Answer: The Cornea.
CARD 5
Why does an animal's pupil get larger (dilate) in the dark?
Answer: To let more light enter the eye to see.
CARD 6
What is the colored circular muscle around the pupil?
Answer: The Iris.
CARD 7
What part inside the eye focuses light onto the retina?
Answer: The Lens.
CARD 8
Where are light receptors located in the eyeball?
Answer: On the Retina (back wall).
CARD 9
What structure carries electrical signals to the brain?
Answer: The Optic Nerve.
CARD 10
Can an owl see in 100% pitch-black darkness? Why or why not?
Answer: No; sight requires light to reflect off objects.
CARD 11
What type of information does reflected light carry?
Answer: Color, shape, size, motion/distance.
CARD 12
What part of the body actually turns signals into an image?
Answer: The Brain.
Amplify Science • Grade 4 Vision & Light Board Game Page 2 of 2
Step 2 (Reflection):
"Light reflects (bounces) off the cricket's surface and carries information about the cricket's color, shape, and size in straight lines toward the gecko."
Step 3 (Eye to Brain):
"Light passes through the cornea and pupil, the lens focuses it on the retina, light receptors turn it into electrical signals, and the optic nerve sends it to the brain."
CER Claim (Wooden Plank Barrier):
"No, the gecko cannot see the cricket. The wooden plank blocks the straight path of light. Because light travels in straight lines and cannot pass through opaque wood, reflected light never enters the gecko's pupil, so no visual signals reach its brain."
Quick Scoring Rubric (4 Points Total)
4 pts All 6 MC correct, accurate diagram, clear light path CER.
