Wednesday, 25 June 2014 14:10

## L7-23: ASTRONOMICAL TELESCOPE - TV

• ID Code: L7-23
• Purpose: Illustratre how an astronomical telescope works.
• Description:

The TV camera functions as the eye, so what the eye sees can be viewed on a monitor or the rear projection screen. At the left below is a direct view of the object scale by the video camera as displayed on the monitor. A 10 cm or a 5 cm convex lens acts as the eyepiece and a 20 cm convex lens is the objective lens for the telescope, with the TV camera focused at infinity (relaxed eye). The rule is positioned across the lecture hall (at infinity) from the telescope. The image is seen to be inverted and to have a magnification M=f(ob)/f(eye). The magnification can be checked by viewing a two-meter stick with the TV camera directly (left) and then with the telescope. The image with a 10 cm eyepiece has a magnification of 20/10=2, seen in the center picture. The image with a 5 cm eyepiece has a magnification of 20/5=4, seen in the picture at the right.

To set up in practice, set the camera focus and lens positions and move the objective lens until the image is seen by the camera.

• Availability: Available
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• #### L7-02: FOCAL PLANE SHUTTER - CHALKBOARD MODEL

Illustrate how a focal plane shutter works Read More
• #### L7-03: SHUTTER SPEED OF A CAMERA

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• #### L7-04: DEPTH OF FIELD AND FIELD OF VIEW

Demonstrate depth of field as a function of aperture setting, and to demonstrate field of view as a function of Read More
• #### L7-05: VIDEO CAMERA WITH VARIOUS LENSES

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• #### L7-11: OPTICAL BOARD - ASTRONOMICAL TELESCOPE

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• #### L7-12: OPTICAL BOARD - TELEPHOTO LENS

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• #### L7-13: OPTICAL BOARD - GALILEAN TELESCOPE

Model the optics of a Galilean telescope Read More
• #### L7-14: OPTICAL BOARD - REFLECTING TELESCOPE

To illustrate rays in one type of reflecting telescope Read More
• #### L7-15: MICROSCOPE

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• #### L7-16: GALILEOSCOPE

Show how the optics and lenses in a telescope work Read More
• #### L7-21: MAGNIFYING GLASS - TV

Illustrate how a magnifying glass works Read More
• #### L7-22: MICROSCOPE - TV

Illustrate how a microscope works Read More
• #### L7-23: ASTRONOMICAL TELESCOPE - TV

Illustrate how an astronomical telescope works Read More
• #### L7-24: TERRESTRIAL TELESCOPE - TV

Illustrate how a terrestrial telescope works Read More
• #### L7-25: GALILEAN TELESCOPE - TV

Illustrate how a Galilean telescope works Read More
• #### L7-31: PRINCIPAL PLANES

Illustrate principal planes of a compound lens system Read More
• #### L7-32: FIELD LENS

Show what a field lens does Read More
• #### L7-33: OVERHEAD PROJECTOR - DISSECTED

Show how an overhead projector works and to view its components Read More
• #### L7-34: SLIDE PROJECTOR - DISSECTED

Show how a slide projector works and to view its parts Read More
• #### L7-41: REAL IMAGE - MIRROR AND LENS

Determine the location of a real image in a complex lens-mirror system Read More
• #### L7-42: VIRTUAL IMAGE - MIRROR AND LENS

Calculate the position of a virtual image and the verify this by using parallax Read More
• #### L7-43: Telephoto Lens Model - Point Source

A model of the assembly and function of a telephoto lens attachment. Read More
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