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Chapter 13- Section 3

Chapter 13- Section 3. OPTICAL INSTRUMENTS. Telescopes. Uses lens or a concave mirror, that is much bigger than your eye to collect light from far away objects Some telescopes can collect more than one million times more light than a human eye. Telescopes continued …….

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Chapter 13- Section 3

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  1. Chapter 13- Section 3 OPTICAL INSTRUMENTS

  2. Telescopes • Uses lens or a concave mirror, that is much bigger than your eye to collect light from far away objects • Some telescopes can collect more than one million times more light than a human eye

  3. Telescopes continued …… • Objects in distant galaxies, like stars and other unknowns look much brighter with a larger telescope • Details are shown better when the image formed by a telescope is so much brighter

  4. Refracting telescopes! • A commonly used telescope is a refracting telescope, that uses lenses to collect light from distant objects • A simple refracting telescope uses two convex lenses to collect and focus light from far away objects

  5. Refracting telescopes continued….. • The objective lens are the first lens that has light pass through from distant objects • Light rays from far away objects are parallel to the optical axis- forms a real image • The eyepiece lens or the second convex lens, magnifies the image

  6. Reflecting telescopes • Uses mirrors and lenses to gather and focus light from far away objects • Light from far away objects hit one end and then strikes the concave mirror on the other end • The light reflects off the mirror, hits a plane mirror then converges at the focal point • Finally the light is creating a real image at the focal point

  7. Space telescopes • The Hubble space telescope was created by NASA to overcome the blurriness of humans eyesight • Now scientists can detect light from planets, stars, and other galaxies

  8. Microscopes • A device that uses two convex lenses wih short focal points to magnify details on smaller objects • Light passes through the image and travels to the objective lens • It forms a real, enlarged image because it is one or two focal points away

  9. Microscopes continued….. • Then the real image turns into a virtual image when it is magnified buy the eyepiece

  10. Cameras • The light rays are parallel in a camera • The shutter opens when you take a picture allowing light to pass through for a certain amount of time • It enters through the aperture and the lens focuses the image on a sensor • Which converts it to electric signals

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