Activity 01
Plane Mirror Properties Station
Place a lighted candle before a plane mirror. Students measure object and image distances, note size, orientation, and inversion using rulers and graph paper. Record findings in a table and draw ray diagrams to explain observations.
Explain the difference between a real image and a virtual image formed by a mirror.
Facilitation TipDuring the Plane Mirror Properties Station, remind students to align the mirror exactly 90 degrees to the ruler to avoid parallax errors when measuring image distance.
What to look forShow students a picture of a common object (e.g., a pencil). Ask them to draw what they think the image in a plane mirror would look like, labelling 'object' and 'image'. Then, ask them to write one sentence describing the difference they observed.
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Activity 02
Curved Mirror Predictions
Provide convex and concave mirrors. Students predict and test image changes for near and far objects, sketching positions and sizes. Discuss why convex mirrors form smaller virtual images useful in vehicles.
Compare the characteristics of an image formed by a plane mirror with the actual object.
Facilitation TipFor Curved Mirror Predictions, provide small concave and convex mirrors so students can trace rays with pencils on paper without straining their eyes.
What to look forPose the question: 'Imagine you are standing in front of a mirror. If you raise your right hand, which hand appears to be raised in the mirror image? Explain why this happens using the term 'lateral inversion'.' Facilitate a brief class discussion to clarify misconceptions.
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Activity 03
Periscope Construction
Build periscopes using cardboard, plane mirrors at 45 degrees. Test viewing around corners, measure field of view. Explain lateral inversion and how two mirrors correct it.
Predict how the image in a mirror would change if the mirror surface was curved.
Facilitation TipWhen guiding Periscope Construction, emphasise precision in aligning both mirrors at 45 degrees to the tube to prevent double images or blurring.
What to look forGive students two scenarios: 1) Light rays meeting after reflection to form an image. 2) Light rays appearing to come from a point behind the mirror. Ask them to identify which scenario forms a 'real image' and which forms a 'virtual image', and to write one characteristic of each.
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Activity 04
Image vs Object Comparison
Use identical objects and mirrors. Pairs photograph object and image, measure heights and distances digitally or with rulers. Analyse differences in a class chart.
Explain the difference between a real image and a virtual image formed by a mirror.
Facilitation TipDuring the Image vs Object Comparison, ask students to label each diagram with ‘object size’, ‘image size’, and ‘image distance’ before moving to the next station.
What to look forShow students a picture of a common object (e.g., a pencil). Ask them to draw what they think the image in a plane mirror would look like, labelling 'object' and 'image'. Then, ask them to write one sentence describing the difference they observed.
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Generate Complete Lesson→A few notes on teaching this unit
Experienced teachers begin with everyday examples like looking at reflections in still water or dressing tables to build prior knowledge. They avoid rushing to ray diagrams; instead, they let students observe lateral inversion first through simple mirror writing tasks. Research shows that students who draw rays themselves internalise the law of reflection better than those who only watch demonstrations.
Students will confidently explain why plane mirror images match object size, appear behind the mirror, and show lateral inversion. They will also distinguish between specular and diffuse reflection and predict curved mirror behaviour using angle measurements and ray diagrams.
Watch Out for These Misconceptions
During the Plane Mirror Properties Station, watch for students who claim images are smaller or larger than the object.
Have students measure both the object length and the image length along the ruler placed perpendicular to the mirror. When they see equal lengths in three trials, they will replace the misconception with measured evidence.
During the Image vs Object Comparison activity, watch for students who assume all mirror images can be projected on a screen.
Ask students to hold a plain white sheet behind the mirror during the Image vs Object Comparison and observe that no image forms. Then guide them to trace the reflected rays backward to see why they diverge and never meet in front of the mirror.
During the Plane Mirror Properties Station, watch for students who believe reflections work the same way on rough surfaces as on smooth mirrors.
Provide both a mirror and a piece of sandpaper at the station. Ask students to write the word ‘HELLO’ on each and observe the clear reflection on the mirror versus the scattered letters on sandpaper, linking this to specular vs diffuse reflection.
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