← General Science / 3 Natural Physical Science
3.1 Thin Lenses
General Science · Grade 11 · 14 lessons in the design
What you will be able to do
- distinguish between converging and diverging lenses as used in science
- locate images formed by thin lenses using ray construction method
- describe the characteristics of images formed by thin lenses
- determine the focal length of a converging lens
- explain the functioning of the human eye as an optical instrument
- describe image formation in the human eye, defects of vision of the human
- outline some of the applications of thin lenses in real-life situations
- appreciate the use of lenses in various optical devices
Key questions
“Why do we use thin lenses?”
Lessons
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Types of lenses
40 min · 1 practice tasks · quizDistinguish between converging and diverging lenses.
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Terms used with lenses
40 min · 1 practice tasks · quizDefine the principal focus, optical centre and focal length.
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Ray diagrams for a converging lens
40 min · 1 practice tasks · quizDraw ray diagrams for a converging lens.
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Ray diagrams for a diverging lens
40 min · 1 practice tasks · quizDraw ray diagrams for a diverging lens.
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Images formed by a converging lens
40 min · 1 practice tasks · quizDescribe the images formed by a converging lens for different object positions.
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Images formed by a diverging lens
40 min · 1 practice tasks · quizDescribe the image formed by a diverging lens.
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Determining the focal length
40 min · 1 practice tasks · quizDetermine the focal length of a converging lens experimentally.
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The eye as an optical instrument
40 min · 1 practice tasks · quizDescribe the human eye as an optical instrument.
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Image formation in the eye
40 min · 1 practice tasks · quizDescribe image formation and accommodation in the eye.
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Defects of vision and correction
40 min · 1 practice tasks · quizDescribe defects of vision and how lenses correct them.
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The camera
40 min · 1 practice tasks · quizDescribe the camera as an application of a converging lens.
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The microscope
40 min · 1 practice tasks · quizExplain the simple and compound microscope using thin lenses.
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Applications of thin lenses
40 min · 1 practice tasks · quizDescribe applications of thin lenses in real life.
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Review of thin lenses
40 min · 1 practice tasks · quizReview lens types, ray diagrams, images, the eye and applications.