A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . FIG. 111. FIG. 112. easy rule for finding the position of an image in a convexmirror. Let AB be the object. Draw one ray from A straighttoward the centre of curvature. This ray will return onitself after reflection, coming as if from C. Draw anotherray from A parallel to the principal axis. This will afterreflection appear to come from P, the principal focus(§ 139). Both reflected rays appear to come from A,which is therefore the image of A. The image of B is found in the
A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . FIG. 111. FIG. 112. easy rule for finding the position of an image in a convexmirror. Let AB be the object. Draw one ray from A straighttoward the centre of curvature. This ray will return onitself after reflection, coming as if from C. Draw anotherray from A parallel to the principal axis. This will afterreflection appear to come from P, the principal focus(§ 139). Both reflected rays appear to come from A,which is therefore the image of A. The image of B is found in the same way. If the object is a straight line, as in this figure, it is cus-tomary to represent the image by drawing a straight line REGULAR REFLECTION OF LIGHT. 167 from A to B. This is inaccurate, as Exercise 22 shouldshow. Fig. 112 shows the same method applied to a concavemirror. 143. Distorted Images.—In Exercises 22 and 23, and in all the figures that have been given representing cylindricalmirrors, we have been dealing with rays which are, bothbefore and after reflection, parallel to the plane on whichthe mirr
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
