學校名稱 教案設計Name of School TWGHs S.C. Gaw Memorial College Teacher Mr. Wong CM, Tony

課題名稱 Topic Light Reflection - Periscope班 級 Class S3學生人數 No. of student 34節數/課時 Lesson / Duration 1 periods

學生已有知識Previous knowledge

1. Law of light – travel in straight line2. Law of Reflection of light

教學理念Rationale

Students should be taught 1. to use straight lines to represent the straight line travelling property of light2. how to use the ray diagrams and apply the law of reflection of light to explain the working principle of the periscope

學習目標Learning objectives

1. Apply the concept of Law of Reflection of light in daily life in periscope mode and in bus mode

教具/物料Teaching aids/materials

Light Reflection - Periscope

教學程序 Teaching Procedure

時間Time

學習重點Learning focuses

學與教過程Strategy and activities

教具/物料Teaching

aids/materials

學習評估Assessment

10 min Application of Law of Reflection of light around us

1. Show pictures of mirror in subways, shops, buses.2. Ask students the use of these mirrors 3. What principle in optics has been used in these examples

PowerPoint 1. Students able to tell the use of the mirrors2. State that Law of Reflection is applied in these examples

10 min Recall the Law of Reflection of light i.e. (a) how to draw

the ray diagram

(b) meaning of normal

(c) angle of incidence and angle of reflection

(d) angle of reflection = angle of incidence

1. Have students draw on the board how to draw the ray diagram explaining Law of Reflection of light on a single mirror

2. Ask students to draw on the same ray diagram how light is reflected if a second mirror is put facing the first one at a distance

Blackboard 1. Students are able to draw the ray diagram for one mirror reflection

2. Students are able to draw ray diagram for the second mirror reflection

3. Students are able to show the Law of Reflection of the diagram by drawing and labelling the normal, angle of incidence and reflection

10 min 1. Introduce the periscope model materials

2. Building the periscope in groups

1. Use the PowerPoint – Light Reflection – Periscope to introduce the materials included in the kit

2. Show students a pre-finished periscope to give them a general idea of the periscope

3. Walk around to help students to finish the periscope

4. Play with the finished periscope

Periscope 1. Successfully finish the periscope

2. Use the periscope in periscope mode and bus mode and play around in the laboratory

5 min Discuss the 1. difficulties of

building the

Post-experiment discussion Finished periscope from

1. State the difficulties

2. Solve the

model,2. ways to solve

the problems,3. improvement

of the periscope

4. modification of the model to make it more useful and interesting

all groups problems encountered

3. Suggest any improvement of the model

4. Suggest ideas modifying the model to make it more useful and interesting

3 min Playing app games using the Law of Reflection of Light

Use app to play game to consolidate students’learning

smart phone and the ‘Laser Reflection’app (android)

Successfully install the app, play and finish the different levels

1. The activity is a bit too simple for S3 students.2. It would be best if every student can have one.3. It would be better if the periscope is long, very long.4. I would suggest students to do their own periscope at home using some

scrap materials. e.g. milk box, pvc tube, etc. A lot YouTube video clips have such ideas. https://www.youtube.com/watch?v=IOpmSUyBZeE&t=243s

5. i-education can help teachers to buy a lot cheap mirrors of different shapes.

6. Some afterschool follow-up activities can be organized for students to make more professional periscopes. e.g. using pvc tube, glue gun and so on.

7. As students like to play smart phone, some app like the one I suggest below can help students to consolidate their learning about Law of Reflections of light. There are some more similar apps in the market.