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LENS APPLICATIONS

LENS APPLICATIONS. 13.5 – PG. 567 to 570. TYPES OF LENS APPLICATIONS. The Camera The Movie Projector. TYPES OF LENS APPLICATIONS. The Magnifying Glass The Compound Microscope The Refracting Telescope. THE CAMERA. Produces a smaller, real image

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LENS APPLICATIONS

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  1. LENS APPLICATIONS 13.5 – PG. 567 to 570

  2. TYPES OF LENS APPLICATIONS • The Camera • The Movie Projector

  3. TYPES OF LENS APPLICATIONS • The Magnifying Glass • The Compound Microscope • The Refracting Telescope

  4. THE CAMERA • Produces a smaller, real image • Acts like converging lens, producing an inverted, real image as long as the object is at a distance greater then F’ (secondary principal of focus) • Takes light from large, distant objects and forms smaller, real images on film or the sensor in a digital camera • Digital cameras use a light-sensitive device made of silicon called a charge-coupled device (CCD), which replaces the film found in traditional cameras • How do Digital Cameras Work • http://www.youtube.com/watch?v=9dXlok8PMLo

  5. THE MOVIE PROJECTOR • A movie projector acts like the opposite of a camera • Projectors take a small object (film) and projects a large, inverted, real image on the screen • The image is larger than the object, meaning the film must be located between F’ and 2F’ • Film must be loaded into the projector upside down so that what you see on the movie screen is upright • Overhead projectors work in a similar way • How a Movie Projectors Works • http://www.youtube.com/watch?v=Ca_4dN8jrbg

  6. THE MAGNIFYING GLASS • The simplest optical device is the magnifying glass, also known as a simple microscope • It is a converging lens, where the object is located between F’ and the lens and does not produce a real image at the object location • Refracted rays spread apart or diverge, creating a larger, upright, virtual image on the same side of the lens as the object • The human brain extends these rays backwards and produces an enlarged, virtual image located on the same side of the lens as the object • Giant Magnifying Glass • http://www.youtube.com/watch?v=ljiTNRiLh-o

  7. THE COMPOUND MICROSCOPE • An arrangement of two converging lenses that produces two enlarged, inverted images: one real and one virtual • The real image is formed by the objective lens and appears in the body tube of the microscope, therefore you do not actually see this image • The virtual image is formed by the eyepiece lens; this larger, virtual image is the image you actually see • Explaining Microscopes • http://www.youtube.com/watch?v=ILZEOnQ_glY

  8. THE REFRACTING TELESCOPE • Same principal as compound microscope, difference being that the object is much farther away • Object in a refracting telescope is so far beyond 2F’ that incident rays passing through the objective lens are considered to be parallel • Produces two enlarged, inverted images: one real image (located in tube of telescope so it cannot be seen) and one virtual image (image you do see) • How Refracting Telescopes Work • http://www.youtube.com/watch?v=VzSjqNE2AHM

  9. IN SUMMARY • A camera uses a converging lens to produce a smaller, inverted, real image of a large object; the object is beyond 2F’, and the real image is located between F & 2F in the camera body • A movie projector uses a converging lens to produce a larger, inverted, real image of a small object; the object (film strip) lies between F’ and 2F’, and the image is located beyond 2F

  10. IN SUMMARY • A magnifying glass, or simple microscope, is a converging lens in which the object is located between the lens and F’. A larger, upright, virtual image is formed on the same side of the lens as the object • A compound microscope consists of two converging lenses and produces a larger, inverted, virtual image. The object is located close to the objective lens • A refracting telescope consists of two converging lenses and produces a larger, inverted, virtual image. The object is so far away from the objective lens that the incident rays that pass through the lens are essentially parallel

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