Topicme934e420ffceb699_1528449000663_0Topic

Construction of images formed by concave mirrors

Levelme934e420ffceb699_1528449084556_0Level

Second

Core curriculumme934e420ffceb699_1528449076687_0Core curriculum

IX. Optics. The student:

5) constructs the path of rays illustrating the formation of virtual images produced by plane mirrors and the creation of real and virtual images produced by spherical mirrors, knowing the locationlocationlocation of the focal point.

Timingme934e420ffceb699_1528449068082_0Timing

45 minutes

General learning objectivesme934e420ffceb699_1528449523725_0General learning objectives

Reconstructs images of objects formed by a concave mirrorconcave mirrorconcave mirror.

Key competencesme934e420ffceb699_1528449552113_0Key competences

1. Analyses the position of an image with respect to a mirror.

2. Recognises the characteristics of an image formed by a concave mirrorconcave mirrorconcave mirror.

Operational (detailed) goalsme934e420ffceb699_1528450430307_0Operational (detailed) goals

The student:

- reconstructs images of objects formed by a concave mirror with respect to the position of an object,

- determines the characteristics of images formed by a concave mirrorconcave mirrorconcave mirror with respect to the position of an object.

Methodsme934e420ffceb699_1528449534267_0Methods

1. Discussion.

2. Experiment.

Forms of workme934e420ffceb699_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionme934e420ffceb699_1528450127855_0Introduction

Revision:

What parameters define the spherical mirror?

How do light rays travel when reflected off a spherical mirror?

What characteristics has an image formed by a plane mirror?

Procedureme934e420ffceb699_1528446435040_0Procedure

Task
What types of images are created in a concave mirrorconcave mirrorconcave mirror?

Make appropriate constructions and check the characteristics of an image formed by a spherical mirror with respect to the position of an object. Consider the following positions y of the object:

Case 1 - the object is located beyond the centre of curvature C: x > 2f.
Case 2 - the object is located at the centre of curvature C: x = 2f.
Case 3 - the object is located between the centre of curvature C and the focal point F: 2f > x > f.
Case 4 - the object is located at the focal point F: x = f.
Case 5 - the object is located between the focal point F and the mirror vertex V: x < f.

Prepare in your notebook the following table and fill it in.
[Table 1]

Answer:
[Table 2]

[Illustration 1]

Definition
The magnification p is the ratio of the image height hIndeks dolny 2 and object height hIndeks dolny 1.me934e420ffceb699_1527752263647_0The magnification p is the ratio of the image height hIndeks dolny 2 and object height hIndeks dolny 1.

p=h2h1

Task
In the image constructions you created before, measure in every case the object height and the image height. Calculate the magnificationmagnificationmagnification.

Task
What is the minimum number of construction rays needed to create an image formed by the concave mirror?me934e420ffceb699_1527752256679_0What is the minimum number of construction rays needed to create an image formed by the concave mirror?

Answer:
The minimum number of construction rays is 2.

Lesson summaryme934e420ffceb699_1528450119332_0Lesson summary

The characteristics of the image formed by concave mirrors are related to the position of the object with respect to the mirror. The image can be enlarged, reduced or the same size as the object. It can be upright (if virtual) or inverted (if real).me934e420ffceb699_1527712094602_0The characteristics of the image formed by concave mirrors are related to the position of the object with respect to the mirror. The image can be enlarged, reduced or the same size as the object. It can be upright (if virtual) or inverted (if real).

Selected words and expressions used in the lesson plan

concave mirrorconcave mirrorconcave mirror

enlarged imageenlarged imageenlarged image

inverted imageinverted imageinverted image

locationlocationlocation

magnificationmagnificationmagnification

ratioratioratio

real imagereal imagereal image

reduced imagereduced imagereduced image

upright imageupright imageupright image

virtual imagevirtual imagevirtual image

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location1
location

położenie

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concave mirror1
concave mirror

zwierciadło wklęsłe

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wymowa w języku angielskim: concave mirror
magnification1
magnification

powiększenie

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wymowa w języku angielskim: magnification
enlarged image1
enlarged image

obraz powiększony

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wymowa w języku angielskim: enlarged image
inverted image1
inverted image

obraz odwrócony

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wymowa w języku angielskim: inverted image
ratio1
ratio

stosunek

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wymowa w języku angielskim: ratio
real image1
real image

obraz rzeczywisty

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wymowa w języku angielskim: real image
reduced image1
reduced image

obraz pomniejszony

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wymowa w języku angielskim: reduced image
upright image1
upright image

obraz prosty

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wymowa w języku angielskim: upright image
virtual image1
virtual image

obraz pozorny

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wymowa w języku angielskim: virtual image