Laws of Reflection Whiteboard
Parallel rays hit flat, concave and convex mirrors — watch them converge on the focus.
Opens a live board in your browser. No install, no hardware.
Flat, concave and convex mirrors. A curvature slider moves the focus.
Reflection is easy to state and hard to picture. Boardsy draws the rays for you: flat mirrors keep them parallel, concave mirrors pull them to a real focus at f = R/2, convex mirrors spread them from a virtual one. Change the curvature and the focus slides with it.
45-minute outline
How to teach it
- Recall (5 min): angle of incidence = angle of reflection — sketch it.
- Show (10 min): send parallel rays at a flat mirror, then a concave one.
- Explore (15 min): students move the curvature slider and locate the focus.
- Apply (10 min): where does the focus go on a convex mirror? Analyze and check.
Standard
NGSS MS-PS4-2
This lesson is built to support NGSS MS-PS4-2 for Grades 6–9. Alignment is a teaching guide, not an official endorsement — check it against your district's pacing.
“The rays actually bending to the focus did more than any diagram I've drawn in ten years.”
Teach Laws of Reflection Whiteboard tomorrow.
Open the live board, invite your class, and start.