Topicmef07691ce96d23c5_1528449000663_0Topic

Plane mirrorplane mirrorPlane mirror

Levelmef07691ce96d23c5_1528449084556_0Level

Second

Core curriculummef07691ce96d23c5_1528449076687_0Core curriculum

IX. Optics. The student:

4) analyses the path of rays coming out of a point in different directions, and then reflected off a plane mirror and spherical mirrors; describes the focusing of rays in a concave mirror and the path of rays reflected off a convex mirror; uses the concepts of focal point and focal length;

8) constructs the images created by the lens; distinguishes real, virtual, upright, inverted images; compares the size of the object and image.

Timingmef07691ce96d23c5_1528449068082_0Timing

45 minutes

General learning objectivesmef07691ce96d23c5_1528449523725_0General learning objectives

Describing a mirror imageimageimage formationformationformation.

Key competencesmef07691ce96d23c5_1528449552113_0Key competences

1. Drawing a diagramdiagramdiagram of a plane mirrorplane mirrorplane mirror image.

2. Describing the formationformationformation of a virtual mirror imageimageimage.

Operational (detailed) goalsmef07691ce96d23c5_1528450430307_0Operational (detailed) goals

The student:

- draws a diagramdiagramdiagram of a plane mirrorplane mirrorplane mirror image,

- describes the formationformationformation of a virtual mirror imageimageimage.

Methodsmef07691ce96d23c5_1528449534267_0Methods

1. Discussion.

2. Experimen.

Forms of workmef07691ce96d23c5_1528449514617_0Forms of work

1. Group work.

2. Work with the whole class.

Lesson stages

Introductionmef07691ce96d23c5_1528450127855_0Introduction

Discussion

What characteristics from the physics point of view has your imageimageimage in a mirror?

Proceduremef07691ce96d23c5_1528446435040_0Procedure

Experiment
Does a candle burn underwater?

Materials:
- transparent CD box,
- candle,
- beaker filled with water,
- ruler.

Procedure:
In a dark room put a CD box on the table.

Hint:
Opening the box makes it more stable. In front of the box place a burning candle, behind the box place a beaker.

1. How should you place the CD box, to make an illusion that the candle burns underwater?

2. Draw a diagramdiagramdiagram in your exercise book.

3. Look at different angles from the candle side at its imageimageimage. What do you observe?

4. Measure the distancedistancedistance between a burning candle and the box as well as the distancedistancedistance between the box and the beaker. Remember to measure the distances between the middle of the candle/beaker and the middle of the CD box. Repeat the measurement for different positions of the candle. The image should be always at the same place in the beaker.

Summary:
The CD box should be placed perpendicularly to the line between the candle and the beaker. The distancedistancedistance between the image and the box is equal to that between the imageimageimage and the box. Regardless of the angle at which we look at the image, it stays always at the same place.

Task
Based on the experiment draw a diagram showing the formation of the virtual image of the candle. Do not forget to apply the law of light reflection.mef07691ce96d23c5_1527752263647_0Based on the experiment draw a diagram showing the formation of the virtual image of the candle. Do not forget to apply the law of light reflection.

Solution:

[Illustration interactive]

Lesson summarymef07691ce96d23c5_1528450119332_0Lesson summary

The plane mirror forms an image which is virtual, upright, the same magnitude as the object and is symmetric to the mirror.mef07691ce96d23c5_1527752256679_0The plane mirror forms an image which is virtual, upright, the same magnitude as the object and is symmetric to the mirror.

Selected words and expressions used in the lesson plan

diagramdiagramdiagram

distancedistancedistance

formationformationformation

imageimageimage

objectobjectobject

planeplaneplane

plane mirrorplane mirrorplane mirror

reflectionreflectionreflection

virtual imagevirtual imagevirtual image