Topicm7e4c27cc9ab7a5d7_1528449000663_0Topic

How the image is formed using converging lenses?

Levelm7e4c27cc9ab7a5d7_1528449084556_0Level

Second

Core curriculumm7e4c27cc9ab7a5d7_1528449076687_0Core curriculum

IX. Optics. The student:

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

Timingm7e4c27cc9ab7a5d7_1528449068082_0Timing

45 minutes

General learning objectivesm7e4c27cc9ab7a5d7_1528449523725_0General learning objectives

Reconstructs images of objects formed by a converging lensconverging lensconverging lens.

Key competencesm7e4c27cc9ab7a5d7_1528449552113_0Key competences

1. Analyses the position of an image with respect to the lens.

2. Recognises the characteristics of an image formed by the converging lensconverging lensconverging lens.

Operational (detailed) goalsm7e4c27cc9ab7a5d7_1528450430307_0Operational (detailed) goals

The student:

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

- determines the characteristics of images formed by a converging lensconverging lensconverging lens with respect to the position of an object.

Methodsm7e4c27cc9ab7a5d7_1528449534267_0Methods

1. Discussion.

2. Experiment.

Forms of workm7e4c27cc9ab7a5d7_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionm7e4c27cc9ab7a5d7_1528450127855_0Introduction

Revision:

- Enumerate the parameters describing the optical system of the lens.

Procedurem7e4c27cc9ab7a5d7_1528446435040_0Procedure

converging lensconverging lensconverging lens is curved outwards on both sides. It is often represented in diagrams by the following symbol.

[Illustration 1]

Construction rules for drawing ray diagrams.

[Illustration 2]

Rule 1.
The direction of the light ray passing through the optical centre of a convex lens remains unchanged.

[Illustration 3]

Rule 2.
The light ray parallelparallelparallel to the optical axis will pass through the focal point F after refractionrefractionrefraction by the lens.

[Illustration 4]

Rule 3.
The light ray passing through the focal point F becomes parallelparallelparallel to the optical axis after refractionrefractionrefraction by the lens.

Definition
The nature of images formed by the converging lenses can be described as:
- enlarged or reduced (how big the image is compared to the object),
- upright (the same way up as the object) or inverted (upside down compared to the object),
- real (behind a lens) or virtual (in front of a lens).
m7e4c27cc9ab7a5d7_1527752263647_0The nature of images formed by the converging lenses can be described as:
- enlarged or reduced (how big the image is compared to the object),
- upright (the same way up as the object) or inverted (upside down compared to the object),
- real (behind a lens) or virtual (in front of a lens).

Task
What characteristics will an image formed by a convex lens for different positions of an object have? Construct the images for the object positions listed in the table and complete the table.m7e4c27cc9ab7a5d7_1527752256679_0What characteristics will an image formed by a convex lens for different positions of an object have? Construct the images for the object positions listed in the table and complete the table.

[illustration interactive]

[Table 1]

Solution:
[Table 2]

Lesson summarym7e4c27cc9ab7a5d7_1528450119332_0Lesson summary

The image formed by a convex lens, depending on its position on the optical axis can be real or virtual, reduced, enlarged or the same in size as the object, inverted or upright.m7e4c27cc9ab7a5d7_1527712094602_0The image formed by a convex lens, depending on its position on the optical axis can be real or virtual, reduced, enlarged or the same in size as the object, inverted or upright.

Selected words and expressions used in the lesson plan

converging lensconverging lensconverging lens

enlarged imageenlarged imageenlarged image

inverted imageinverted imageinverted image

parallelparallelparallel

real imagereal imagereal image

reduced imagereduced imagereduced image

refractionrefractionrefraction

upright imageupright imageupright image

virtual imagevirtual imagevirtual image

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inverted image1
inverted image

obraz odwrócony

R2mMUg0NXQH0Z1
wymowa w języku angielskim: inverted image
converging lens1
converging lens

soczewka skupiająca

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wymowa w języku angielskim: converging lens
parallel1
parallel

równoległy

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wymowa w języku angielskim: parallel
refraction1
refraction

załamanie

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wymowa w języku angielskim: refraction
enlarged image1
enlarged image

obraz powiększony

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wymowa w języku angielskim: enlarged image
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