QCP 521Reflection of Light Lesson Plan

Nanyang Technological University


QCP 521 Teaching of Physics II

Lesson Plan and Microteaching

Topic: Reflection of Light

Name:Koh Chung Kiat

NRIC No.:S7828882E

Matriculation No.: 054556D23

Tutor: Dr K.C. Yap

Class: LG01/TG01
Topic:Reflection of Light

Duration: Double Period (70 minutes)

Students’ Abilities: Mixed Ability

Location:Physics Laboratory

Level: Secondary 3 Express Students (Pure Physics)

Students’ Prior Knowledge and Skills:

Students should be able to:

  1. state the properties of light
  2. explain how reflection is different for smooth and rough surfaces
  3. state the characteristics of the image formed by the plane mirror

Objectives of the lesson:

At the end of the lesson, students should be able to:

1.identify the normal, angle of incidence and angle of reflection, which are used in the concept of reflection of light

2.state the laws of reflection

3.construct ray diagrams to illustrate the formation of images of an object by a plane mirror

IT Resources: Applet and OHT

Non IT Resources: Worksheet

Equipment Used in Induction & Activity:

Full Length Mirror, Cardboard Arrows, Ruler, Protractor, Small Plane Mirror, Pins, Plain Paper & Soft Board.

Analysis of Main Concepts and Structure of Knowledge:

Teaching/Learning Activities

Duration / Activities / Resources / Rationale
5 min /
  • Teacher is to ask students to state the properties of light.
  • Teacher is to ask students how reflection is different for smooth and rough surfaces.
  • Teacher is to provide the lesson objectives to the students.
/
  • Worksheet
/
  • This is to help students recap their prior knowledge on light, reflection, which will be applied in the session.
  • Lesson objectives are provided to allow students to know what to expect during the lesson.

10 min / Set Induction:
  • Teacher is to use the 2 examples of light ray diagrams that are wrongly drawn to spark the thinking process of the students.
  • Teacher is to ask a few students to stand in front of a full length mirror or normal mirror and deduce the path of the light ray from an object to the eye.
/
  • Full length mirror or normal mirror
  • Worksheet
  • Cardboard arrows
/
  • By showing the negative examples, teacher would encourage students to use their prior knowledge to analyse the errors in the ray diagrams, which would spark their interest in the following activity.
  • This is to encourage students to think about the path of a light ray when they see an image in the mirror before conducting the activity, so that they would appreciate the purpose of this session.

20 min / Activity to study reflection of light
  • Teacher is to explain the procedure of conducting the activity to the students, and to remind students what they are supposed to find.
  • Students are to work in pairs for this activity and will collect 1 set of equipment per pair from the teacher’s table.
  • Teacher is to move around the laboratory to assist students in completing the activity.
/
  • Worksheet
Equipment required:
  • Ruler
  • Protractor
  • Small plane mirror
  • Pins
  • Plain paper
  • Soft board
/
  • The work is done in pairs so as to help one another in times of difficulty. Also, students can apply cooperative learning in this session.
  • Teacher needs to move around to ensure that students are on task as well as checking on their measurement and experimental skills.

5 min /
  • Teacher is to ask a few students to identify and explain the following terms from a ray diagram:
Normal
Angle of incidence
Angle of reflection /
  • OHT 1
/
  • The purpose of asking students these questions is to assess the students’ understanding of the activity, and to reinforce the students’ concept of the terms used in reflection of light.

5 min /
  • Teacher is to ask students to state and explain the characteristics of images formed by the plane mirror.
/
  • Worksheet
/
  • This is to help students recap their prior knowledge on characteristics of images formed by a plane mirror, which will be used later.

20 min /
  • Teacher is to show students the applet on reflection of light to induce the laws of reflection and to show students the position of an image formed by a plane mirror.
  • Teacher is to draw diagrams on the applet to show students how an image would look like when an object is placed in front of a mirror.
  • Students who would like to try using the applet can do so under the guidance of the teacher while the rest of the students complete their worksheets.
/
  • Applet
/
  • The applet is an easy tool to allow students to observe the laws of reflection and the position of the image formed by the plane mirror.
  • By allowing a hands-on session for the students to use the applet, they are able to reinforce their concepts of this topic.

5 min / Lesson Closure
  • Teacher is to sum up the concepts that the students have discovered and the laws of reflection.
  • Students are required to complete the worksheet and hand in the worksheet to the teacher at the end of the session.
/
  • Worksheet
/
  • This is done so as to reinforce the concepts learnt in this session
  • The worksheet is used to assess the students’ knowledge and their understanding of the topic.

reflection of light Worksheet

Name:______Date: ______

Class: 3/___

What you will be learning today:

  1. Identify the normal, angle of incidence and angle of reflection, which are terms used in the concept of reflection of light
  1. State the laws of reflection
  1. Construct ray diagrams to illustrate the formation of images of an object by a plane mirror

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Revision: What are the properties of light?

______

______

Revision: How is reflection of light different for smooth and rough surfaces?

______

______

What is wrong with the following light ray diagrams?

______

______

______

How does light ray from your hand reflect from the mirror and reach your eye?

______

______

Activity:

The following activity will be carried out in pairs. Follow the instructions provided at the back of this worksheet. You and your partner will be required to complete the following table and answer the questions below.

What is the normal?

______

______

What is the angle of incidence?

______

______

What is the angle of reflection?

______

______

Experiment Set No. / Angle of Incidence / Angle of Reflection / Remarks

What can you observe from this experiment?

______

______

Revision: What are the characteristics of images formed by plane mirrors?

______

______

State the laws of reflection.

______

______

Complete the ray diagram bylabellingthe normal, angle of incidence and angle of reflection.

Instructions for Activity to Study Reflection of Light

  1. Collect 1 set of the following equipment from the teacher’s table.
  2. Ruler
  3. Protractor
  4. 2 pieces of plain paper
  5. 4 pins
  6. Small plane mirror
  7. Soft board
  8. Place a piece of paper above the soft board. Draw a horizontal line across the paper. The mirror will be placed upright along the line. Draw another line which is perpendicular to the first line. This line represents the normal to the plane mirror. Label the point of intersection of the normal and the mirror as point N.
  9. Now, draw a line NA in such a way that line NA is making a 45 with the mirror.
  10. Place the mirror along the horizontal line. Insert 2 pins, P1 and P2 on the line NA. When your eye is in level with the pins and the mirror,you should be able to see the images of the pin the mirror on the other side of the normal.
  11. Insert another pin, P3, on the other side of the normal such that it is in line with the images of P1 and P2.
  12. Insert another pin, P4, on the other side of the normal such that it is in line with pin P3 and the images of P1and P2.
  13. Remove the mirror and the pins. Draw a line from point N passing through the points P3 and P4, extending to point B.
  14. The angle of incidence of a light ray is the angle that the incident light rays from the pins P1and P2 make with the normal. The incident light ray is represented by the line NA. Measure this angle and record it in the worksheet provided.
  15. The angle of reflection of a light ray is the angle that the reflected light rays make with the normal. The reflected light ray is represented by the line NB. Measure this angle and record it in the worksheet provided.
  16. Repeat steps 2 to 9 using a different angle to the mirror and label the linesNA’ and NB’. Record your readings and observations on the worksheet.
  17. Using a new sheet of paper, repeat the entire activity using different angles. There should be 2 sets of light rays on each sheet of paper.
  18. Before submitting the worksheet at the end of the lesson, each student should attach one sheet of paper with the completed light rays to the back of the worksheet.

OHT 1

Reflection of Light Applet

References:

GCE ‘O’ Level Syllabus:

Lower Secondary Science Syllabus:

Tan, O. S., Parsons, R. D., Hinson, S. L., & Sandro-Brown, D. (2003) Educational Psychology: A Practitioner-Researcher Approach. An Asian Edition (pp. 81-87). Singapore: Thomson.

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