Optical telescope

in this presentation analyzing optical telescope and type of lens then lens telescope compared newton telescope in university of sulaimani. tell me for other description.

1. University of Sulaimani College of Education Physics Department First stage Telescope karbin kamaran Sunday jan 27,2017 [email protected] 2016-2017

2. outline Types of telescopes History Lenses Telescopes Make telescope Summary

3. Radio telescopes Millimeter telescopes Sub-millimeter telescopes Infrared telescope Optical telescopes Ultraviolet telescopes X-ray telescopes Gamma ray telescopes Types of telescopes

4. Reflecting Refracting General types of Telescopes

5. Hans Lippershey invented the refractor telescope in 1608. Galileo the first to use a telescope in astronomy. Galileo's designs used a combination of convex and concave lenses. Kepler improved the design to have two convex lenses, which made the image upside-down. Kepler's design is still the major design of refractors today, with a few later improvements in the lenses and the glass to make them. History

6. Types of Lenses Double Convex Double Concave Concave Meniscus Plano Convex Plano Concave Convex Meniscus Edges Edges Centers

7. A Convex Lens Converges Light Rays f

8. The two telescopes are: Astronomical Terrestrial Opera glass

9. Astronomical Telescope The astronomical telescope is composed of an objective lens (convex) and an eyepiece lens (convex). As demonstrated in an earlier slide the objective lens by itself produces a diminished, real, inverted image of a distant object being viewed. ( Note : The final image produced by the astronomical telescope will be magnified, virtual, inverted .) For distant objects the image (produced by the objective lens) is just outside the focal point of the objective lens.

10. Eyepiece Of Astronomical Telescope The eyepiece lens is used as a simple magnifying glass to observe the image formed by the objective lens. This image formed by the eyepiece is a virtual image of the real image produced by the objective. The observer will see an inverted image with this type of telescope.

11. f The Astronomical Telescope Eyepiece (Convex Lens) (Shorter focal length) Objective (Convex Lens) (Longer focal length) f f

12. Inverter Lens In Terrestrial Telescope A third lens can be introduced between the objective lens and the eyepiece lens of an astronomical telescope in such a way as to produce an upright image for the observer. This lens effectively transforms the astronomical telescope into a terrestrial telescope.

13. Eyepiece (Convex Lens) (Shorter focal length) Objective (Convex Lens) (Longer focal length) Inverter (Convex Lens) (Shorter focal length) The Terrestrial Telescope

14. Make telescope

15. Telescope Summary Follows

16. The Astronomical Telescope Eyepiece (Convex Lens) (Shorter focal length) Objective (Convex Lens) (Longer focal length) Telescope Summary Follows

17. Eyepiece (Convex Lens) (Shorter focal length) Objective (Convex Lens) (Longer focal length) Inverter (Convex Lens) (Shorter focal length) Telescope Summary Follows The Terrestrial Telescope

18. Thank you for time

19. Time for Discussion