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Optics and Telescope

Chap. 6: Optics and Telescope (pdf)

Telescope: Light-gathering Power •The light-gathering power of a telescope is directly proportional to the area of the objective lens, which in turn is proportional to the square of the lens diameter – Human iris: 3 mm – Galileo’s refraction telescope: 3 cm ; 100 times better in gathering light – Modern telescope: 10 m ; 10,000,000 times

Telescope: Magnifying Power •Magnifying power, or magnification, is equal to the focal length of the objective divided by the focal length of the eyepiece. It helps to see fine details of extended images. e.g., Moon 0.5°, Galileo viewed as 10°; or a 20X telescope •Magnification power is limited by the nature of light •The Primary purpose of a telescope is for its light-gathering power. The magnifying power is the secondary.

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