Binoculars or binocular telescopes
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Binoculars or binocular telescopes

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Binoculars or binocular telescopes Binoculars or binocular telescopes Presentation Transcript

  •  
    • 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.
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    • GALI LEAN TELESCOPE
    • Found in 17 th century
    • Mounting two telescopes side by side for binocular vision
    • Convex objective & concave eyepiece lens
    • .
    • PORRO PRISM BINOCULARS
    • Found by Ignazio porro in 1854
    • Improved image & higher magnification
    • They are used in keplerian telescopes
    • The disadvantage of keplerian telescope is inverted images are formed
    • Two prisms are used
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  • Z -SHAPE CONFIGURATION
    • Found in 1870
    • Purpose is to erect the image
    • Objective lens in line with the eye piece
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    • MAGNIFICATION
    • Ratio of focal length of eyepiece & focal length of the object gives the linear magnification
    • OBJECTIVE DIAMETER
    • Diameter of the objective lens determines how much amount light can be gathered to form a image
    • Expressed in millimeters
    • FILED OF VIEW
    • Field of view is determined by the optical design
    • Notated in angular value as how many degrees can be viewed
    • General use - hand held binoculars
    • Military use - naval ship binoculars
    • Astronomical – for viewing planets ,comets and supernova seeking
  • GENERAL BINOCULAR TELESCOPE ASTRONOMICAL BINOCULAR TELESCOPE NAVAL SHIP BINOCULAR TELESCOPES
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    • THANKYOU
    • PRESENTED BY
    • MOHAN KUMAR
    • A student of shri prakash institute of optometry-DR.AGARWALS EYE HOSPITAL (Chennai, Tamilnadu)