Microscopes and Telescopes
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
Construct Your Own Problem Consider a telescope of the type used by Galileo, having a convex objective and a concave eyepiece as illustrated in part (a) of Figure 2.40 . Construct a problem in which you calculate the location and size of the image produced. Among the things to be considered are the focal lengths of the lenses and their relative placements as well as the size and location of the object. Verify that the angular magnification is greater than one. That is, the angle subtended at the eye by the image is greater than the angle subtended by the object.
Chapter 3 - The Science of A stronomy Plato (428-348 BC) ● All natural motion i s ircular ● Reason i s more important than o bservation Aristotle (384-322 BC) ● Wrote P hysics ● Elements o Earth: anything that’s solid; center of universe; humans on top of earth nd o Water: 2 heaviest element; s its on f earth o Air: above water o Fire: ises to t eavens ● Idea that each e lement returns to where it belongs o Dropping a r ock, releasing as ● Where do the h eavens b elong th o Quintessence: the 5 element where the heavens belong; incorruptible place o All motions in heavens are perfect circles, constantly moving at same speed/direction ● The universe was f inite ● Laws that govern planets/stars different from those on earth Aristarchus – 1 to sugge hat earth orbits sun Eratosthenes – 1 o measure iameter of arth Claudius Ptolemy (AD 100-170) ● Wrote A lmagest o Star catalogue o Instruments o Motions & model of planets, un, oon ● All e vidence pointed to arth @ center ● The model fit t he data, bu as horribly