Optics. Starter Can you complete this diagram? What is this shape of lens called? Principal axis.
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Transcript of Optics. Starter Can you complete this diagram? What is this shape of lens called? Principal axis.
Learning Objectives
• Know key terms related to convex lenses.
• Know the effect of a convex lens on: a diverging beam of light, a parallel beam of light.
• Know how a camera and projector produce an image.
• Know how to find the size of an image.
Success criteria• Describe the effect of a convex lens
on: a diverging beam of light, a parallel beam of light having done an experiment. (Grade C)
• Explain the difference between a camera and projector. (Grade C)
• Use scale diagrams to find image sizes. (Grade A)
Convex lenses• Convex lenses are also called
converging lenses, because they bring light rays together to a focal point.
• The focal length is measured from the centre of the lens to the focal point.
• Measure the focal length on your diagram.
Thicker Lenses
• Thicker lenses bend light more, and so are more powerful – they have shorter focal lengths. What about the eye?
Uses of convex lenses• Convex lenses are used in:• Telescopes• Cameras• The thing which is allowing you to
read this!
They use convex lenses to focus what is called a real image.
Real Images
• Projectors and cameras both produce real images.
• Light from the object actually reaches a screen or film.
Learning Objectives
• Know key terms related to convex lenses.
• Know the effect of a convex lens on: a diverging beam of light, a parallel beam of light.
• Know how a camera and projector produce an image.
• Know how to find the size of an image.
Success criteria• Describe the effect of a convex lens
on: a diverging beam of light, a parallel beam of light having done an experiment. (Grade C)
• Explain the difference between a camera and projector. (Grade C)
• Use scale diagrams to find image sizes. (Grade A)