By B. Crowell
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Extra info for Discover Physics
The birth of stars example 4 Orion is the easiest constellation to find. You can see it in the winter, even if you live under the light-polluted skies of a big city. Figure h shows an interesting feature of this part of the sky that you can easily pick out with an ordinary camera (that’s how I took the picture) or a pair of binoculars.
The figure above shows the simplest refracting tele- 56 Chapter 3 Images real image eyepiece small angle objective big angle fo fe A refracting telescope. The rays coming from the object first encounter a relatively weak lens, called the objective. An intermediate real image is formed, but what your eye sees is an image of the image, created by the eyepiece lens. The solid lines are two rays that are both coming from the same point in the sky; because the celestial object is so far away, they’re essentially parallel.
Therefore the reflected ray must be right on top of the incident ray, straight back up. Because this is the simplest possible specular reflection, we define these angles as zero: all rays have their angles measured with respect to perpendicular, not with respect to the surface itself. Typically the rays themselves will not be perpendicular to the surface, but we still measure their angles with respect to an imaginary line perpendicular to the surface, which we call the normal. ) Now what if the incident angle isn’t zero?
Discover Physics by B. Crowell