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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CONVERSATION III. Of the Refraction of Light CHARLES. If glass stop the rays of light, and reflect them, why cannot I see myself in the window ? Tutor. It is the silvering on the glass which causes the reflection, otherwise the rays would pass through it without being stopped, and if they were not stopped, they could not be reflected. No glass, however is so transparent, but it reflects some rays: put your hand to within three or four inches of the window, and you see clearly the image of it. James. So I do, and the nearer the hand is to the glass, the more evident is the image, but it is formed on the other side of the glass, and beyond it too. Tutor- It is; this happens also in looking-glasses: you do not see yourself on the surface, but apparently as far behind the glass, as you stand from it in the front. Whatever suffers the rays of light to pass through it, is called a medium. Glass, which is transparent, is a medium; so also is air, water, and indeed all fluids that are transparent are called media, and the more transparent the body, the more perfect is the medium. Charles. Do the rays of light pass through these in a straight line ? Tutor. They do: but not in precisely the same direction in which they were moving before they entered it. They are bent out of their former course, and this is called refraction. James. Can you explain this term more clearly ? Tutor. Suppose A B (Plate i. Fig. 2.) to be a piece of glass, two or three inches thick; and a ray of light s a, to fall upon itat a, it will not pass through in the direo tion s .9, but when it comes to a, it will be bent towards the perpendicular a b, and go through the glass in the course a x, and when it comes into the air, it will pass oa in the direction x z, which is parallel to s ....
| ISBN-13 | 9780217547222 |
|---|---|
| ISBN-10 | 0217547222 |
| Weight | 0.73 Pounds |
| Dimensions | 9.00 x 6.00 x 0.50 In |
| List Price | $19.99 |
| Format | Paperback |
|---|---|
| Pages | 220 pages |
| Publisher | |
| Published On | 2009-08-01 |
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