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Topic Content:
- Meaning of Telescope
- Astronomical Telescope
- Astronomical Telescope with Final Image at Near Point
- Astronomical Telescope in Normal Adjustment (Final Image at Infinity)
- Galilean Telescope
- Galilean Telescope in Normal Adjustment (Final Image at Infinity)
- Galilean Telescope With Final Image at Near Point (Not in Normal Adjustment)
- Advantages of a Galilean Telescope
- Disadvantages of a Galilean Telescope
Telescopes are instruments used for viewing distant objects such as stars and meteors. They make distant objects appear brighter, clearer and magnified.
Types of telescopes include:
- Astronomical telescope
- Galilean telescope
Astronomical Telescope:
The simplest telescope is the astronomical telescope.
An astronomical telescope consists of two converging lenses, the objective lens has a long focal length and the eyepiece has a short focal length. The objective forms a real diminished image of a distant object at its focal length.
Rays from distant objects such as stars are nearly parallel on reaching the objective lens and form a real, inverted, diminished image of the object at the focus of the objective lens, Fo .
Astronomical Telescope with Final Image at Near Point:
When the image of a telescope forms an image at near point, the telescope is not in normal adjustment, the eye is accommodated,
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