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The Spoon Mirror: Inward and Outward Curves
Observe and distinguish mirror types · Hands-on Science
This opening unit grounds the chapter in direct sensory experience before any definitions are given, so resist naming the mirror types until the final consolidation band. Watch for students who describe the inner-surface image as 'upside down only when far' — that anticipates a later unit but is worth a quick note to return to rather than resolving now. A useful checkpoint: can every student correctly identify which surface is concave and which is convex before the unit closes?
0-8Teacher orients the class to the chapter's starting point — curved mirrors as an extension of the plane-mirror knowledge from Grade 7 — and distributes spoons.
8-30Students individually explore both surfaces of the spoon, sketching observations of orientation and size for each surface in a two-column chart.
30-40Pairs share their charts and reconcile any disagreements about orientation or size.
40-45Brief whole-class consolidation: teacher names the two mirror types — concave (curves inward) and convex (curves outward) — and connects them to students' spoon observations.
Competency (C-2.4). Demonstrate rectilinear propagation and verify the laws of reflection through manipulation of light sources, objects, and apparatus including curved mirrors.
Learning outcome. Students can identify a curved mirror as concave or convex by examining the direction of curvature of its reflecting surface and justify the classification using geometric terms.
A student looks at the side of a curved mirror and notices that the reflecting surface curves away from the observer — like the outside of a bowl. Which type of mirror is this, and which surface of a metallic spoon shows the same type of curvature?
- A Concave mirror; the inner surface of the spoon
- B Convex mirror; the inner surface of the spoon
- C Convex mirror; the outer surface of the spoon
- D Plane mirror; neither surface of the spoon
C. Convex mirror; the outer surface of the spoon
What each wrong option reveals
- A Confuses the direction of curvature: the student associates 'curving away from the observer' with the inward-facing (concave) surface rather than the outward-facing one.
- B Correctly identifies the mirror type as convex but maps it to the wrong spoon surface — the inner (concave) surface rather than the outer (convex) surface.
- D Does not connect curved mirrors to the spoon activity at all, defaulting to the plane mirror studied in Grade 7.
Also saved as 9 periods or 11 periods or 13 periods.
- 2Identifying Curvature: Which Way Does It Curve?
Observe and distinguish mirror types - 3Moving Closer, Moving Away: Image Changes in a Concave Mirror
Classify image characteristics by mirror type and distance - 4Always Erect, Always Smaller: The Convex Mirror
Classify image characteristics by mirror type and distance - 5Mapping Image Behaviour: A Three-Mirror Comparison
Classify image characteristics by mirror type and distance - 6Tracing Beams: Discovering the Equality of Angles
Investigate and verify the laws of reflection - 7The Bent Paper Test: Coplanarity of Incident and Reflected Rays
Investigate and verify the laws of reflection - 8Parallel Beams and Three Mirrors: Converge, Diverge, or Stay Parallel?
Investigate and verify the laws of reflection - 9A Water-Drop Lens: Discovering Refraction at a Curved Surface
Explore lenses as refracting optical surfaces - 10Close Up and Far Away: Image Characteristics Through Both Lens Types
Explore lenses as refracting optical surfaces - 11Parallel Beams Through Glass: Flat Plate, Convex, and Concave Lens
Explore lenses as refracting optical surfaces - 12Burning Paper with Mirror and Lens: Applying Convergence
Predict and explain image formation using converging/diverging behaviour and reflection laws - 13Angle Calculations and Assertion-Reason: Applying the Laws
Predict and explain image formation using converging/diverging behaviour and reflection laws - 14Match the Image: Predicting Mirror and Lens Type from Description
Predict and explain image formation using converging/diverging behaviour and reflection laws - 15Designing the Optical Station: A Street-Safety Installation
Predict and explain image formation using converging/diverging behaviour and reflection laws
- 1. Exploring the Investigative World of Science
- 2. Beyond Our Naked Eye
- 3. Health: The Ultimate Treasure
- 4. Magnetic and Heating Effects
- 5. Exploring Forces
- 6. Pressure, Winds, Storms, and Cyclones
- 7. Particulate Nature of Matter
- 8. Elements, Compounds, and Mixtures
- 9. The Amazing World of Solutes, Solvents, and Solutions
- 10. Light: Mirrors and Lenses
- 11. Keeping Time with the Skies
- 12. How Nature Works in Harmony
- 13. Earth, a Unique Life Sustaining Planet
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