Stranica 28 [28]
OCR
8 LIGHT AND WATER over the horizontal mirror (Fig. 3), the image of any point A on the base of the object will appear—no matter what the position of the observer—at a, as far below the surface of the mirror in a vertical line as the point A itself is above it (the perpendicular line Aa being bisected by the surface of the mirror at O) ; in the same way the image of B will appear at 4, that E Fig. 3. The reflexion is a new view of the object reflected. of C will appear at c, and so on for every other point; so that we get an inverted image adc, in which every part of the object is exactly reproduced. The image thus formed is called a vzvtual image, because, though it has no actual existence, the effect on the eye is exactly the same as if it were a real object. If the right hand is held up to a looking-glass a left hand appears on the other side; so we may say that the image is related to the object reflected in the same way that the left hand is related to the right. The
