Binoculars or binocular telescopes

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Binoculars or binocular telescopes

  1. 2. <ul><li>Binocular telescopes or binoculars (also known as field glasses), are two identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. </li></ul>
  2. 4. <ul><li>GALI LEAN TELESCOPE </li></ul><ul><li>Found in 17 th century </li></ul><ul><li>Mounting two telescopes side by side for binocular vision </li></ul><ul><li>Convex objective & concave eyepiece lens </li></ul>
  3. 5. <ul><li>. </li></ul>
  4. 6. <ul><li>PORRO PRISM BINOCULARS </li></ul><ul><li>Found by Ignazio porro in 1854 </li></ul><ul><li>Improved image & higher magnification </li></ul><ul><li>They are used in keplerian telescopes </li></ul><ul><li>The disadvantage of keplerian telescope is inverted images are formed </li></ul><ul><li>Two prisms are used </li></ul>
  5. 9. Z -SHAPE CONFIGURATION
  6. 10. <ul><li>Found in 1870 </li></ul><ul><li>Purpose is to erect the image </li></ul><ul><li>Objective lens in line with the eye piece </li></ul>
  7. 13. <ul><li>MAGNIFICATION </li></ul><ul><li>Ratio of focal length of eyepiece & focal length of the object gives the linear magnification </li></ul><ul><li>OBJECTIVE DIAMETER </li></ul><ul><li>Diameter of the objective lens determines how much amount light can be gathered to form a image </li></ul><ul><li>Expressed in millimeters </li></ul><ul><li>FILED OF VIEW </li></ul><ul><li>Field of view is determined by the optical design </li></ul><ul><li>Notated in angular value as how many degrees can be viewed </li></ul>
  8. 14. <ul><li>General use - hand held binoculars </li></ul><ul><li>Military use - naval ship binoculars </li></ul><ul><li>Astronomical – for viewing planets ,comets and supernova seeking </li></ul>
  9. 15. GENERAL BINOCULAR TELESCOPE ASTRONOMICAL BINOCULAR TELESCOPE NAVAL SHIP BINOCULAR TELESCOPES
  10. 17. <ul><li>THANKYOU </li></ul><ul><li>PRESENTED BY </li></ul><ul><li>MOHAN KUMAR </li></ul><ul><li>A student of shri prakash institute of optometry-DR.AGARWALS EYE HOSPITAL (Chennai, Tamilnadu) </li></ul>

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