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PHYSICS 3

PHYSICS 3. Drawing Ray Diagrams (1). Draw one ray from the top of the object parallel to the centre axis. This is refracted through the principal focus. Draw a second ray through the centre of the lens. This passes straight on – it is not refracted at all!

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PHYSICS 3

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  1. PHYSICS 3

  2. Drawing Ray Diagrams (1) • Draw one ray from the top of the object parallel to the centre axis. This is refracted through the principal focus. • Draw a second ray through the centre of the lens. This passes straight on – it is not refracted at all! • Where the rays meet the image is formed.

  3. Drawing Ray Diagrams Two light rays leave the object O and pass through the lens. Where they meet an image I is produced. This is a REAL, DIMINISHED and INVERTED image. Lens

  4. Convex Lens Ray Diagrams – Object at 2F Image is real, inverted and the same size as the object.

  5. Convex Lens Ray Diagrams – Object Between 2F and F Image is real, inverted and magnified.

  6. Convex Lens Ray Diagrams – Object Between F and C Magnifying Glass Image is virtual, upright and magnified.

  7. Saturday, 07 June 2014 Using Convex Lenses Lesson objectives • Know how a convex lens can be used as a magnifying glass. • Be able to use a convex lens to produce magnified and diminished real images.

  8. Magnifying Glass The focal length of your lens is about 15 cm. Use your lens to focus an image of the outside on the white screen. You should obtain a real, inverted and diminished image the focal length away from the lens. Check this out for yourself.

  9. Using a Magnifying Glass When you place it nearer an object than the focal length it acts as a magnifying glass. You obtain a magnified, virtual, upright image! Check this out for yourself.

  10. Finding The Image Move plane screen to see focused image X- wire screen Convex lens in holder Distance v Distance u

  11. Results

  12. Analysis – Answer using complete sentences. • What is the condition to produce a magnified real image? • When is the image the SAME SIZE as the object? • What sort of image is produced in a camera? • Where must the object be placed for a camera to obtain its image? • Where must the object be placed in a projector?

  13. Optics Test 1.Which statement is true? A. Virtual images can be projected onto screens B. Erect images are upside-down C. Concave mirrors are diverging D. Biconcave lenses are diverging 

  14. Optics Test 2.Which statement is true? A. Diminished images are smaller than the object B. Convex mirrors are converging C. Biconvex lenses are diverging D. Real images can not be projected onto screens 

  15. Optics Test 3.What optical device is shown? A. Biconvex lens B. Biconcave lens C. Plane mirror D. Concave mirror 

  16. Optics Test 4.What optical device is shown? A. Biconvex lens B. Biconcave lens C. Convex mirror D. Concave mirror 

  17. Optics Test 5.What does the diagram demonstrate? A. Biconcave lenses are diverging B. Biconvex lenses are converging C. Biconcave lenses are converging D. Biconvex lenses are diverging 

  18. Optics Test 6.What does the diagram demonstrate? A. Concave mirrors are diverging B. Convex mirrors are converging C. Concave mirrors are converging D. Convex mirrors are diverging 

  19. Optics Test 7.Which part of the eye detects light? A. Cornea B. Lens C. Optic nerve D. Retina 

  20. Optics Test 8. Which device can be used to correct for short-sightedness? A. Concave mirror B. Convex mirror C. Biconvex lens D. Biconcave lens 

  21. Optics Test 9.Which optical instrument is shown? A. A compound microscope B. A magnifying glass C. A refracting telescope D. A reflecting telescope 

  22. Optics Test 10.Which force limits the size of astronomical refracting telescopes on Earth? A. Frictional B. Electrostatic C. Gravitational D. Magnetic 

  23. The Eye lens vitreous humour iris aqueous humour optic nerve retina cornea ciliary muscle

  24. Eye Defects – Long Sight Long sightedness is when you can see distant objects clearly but not close objects. Long sightedness can be corrected using a convex lens.

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