Science
Waves, Light & Sound
Conceptual
11–12 yrs
Reflection & Refraction
反射与折射
Description
State the law of reflection (angle of incidence = angle of reflection) and explain refraction as the change in speed and direction when light crosses a boundary between two media; apply ray diagrams for plane mirrors and refracting surfaces
Mastery Evidence
- States the law of reflection and applies it to draw a reflected ray correctly
- Draws a ray diagram for a plane mirror showing a virtual image
- Explains why a pencil looks bent in a glass of water using refraction
- Explains qualitatively why light bends towards the normal when entering a denser medium
Assessment Prompt
If your child put a straw in a glass of water and it looked bent at the surface, could they explain why that happens — drawing a diagram to show the path of light at the water’s surface?
