Transcript
Page 1: Binoculars or binocular telescopes
Page 2: Binoculars or binocular telescopes

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.

Page 3: Binoculars or binocular telescopes
Page 4: Binoculars or binocular telescopes

GALI LEAN TELESCOPE Found in 17th century Mounting two telescopes side by side for binocular

vision Convex objective & concave eyepiece lens

Page 5: Binoculars or binocular telescopes

.

Page 6: Binoculars or binocular telescopes

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

Page 7: Binoculars or binocular telescopes
Page 8: Binoculars or binocular telescopes
Page 9: Binoculars or binocular telescopes

Z -SHAPE CONFIGURA

TION

Page 10: Binoculars or binocular telescopes

Found in 1870 Purpose is to erect the image Objective lens in line with the eye piece

Page 11: Binoculars or binocular telescopes
Page 12: Binoculars or binocular telescopes
Page 13: Binoculars or binocular telescopes

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

Page 14: Binoculars or binocular telescopes

General use - hand held binoculars Military use - naval ship binoculars Astronomical – for viewing

planets ,comets and supernova seeking

Page 15: Binoculars or binocular telescopes

GENERAL BINOCULAR TELESCOPE

ASTRONOMICAL BINOCULARTELESCOPE

NAVAL SHIP BINOCULAR TELESCOPES

Page 16: Binoculars or binocular telescopes
Page 17: Binoculars or binocular telescopes

- THANKYOU- PRESENTED BY- MOHAN KUMAR

- A student of shri prakash institute of optometry-DR.AGARWALS EYE

HOSPITAL (Chennai, Tamilnadu)


Recommended