Gilbert light experiments for boys . 110 GILBERT BOY ENGINEERING. (2) (3)Fig. 163. How images are formedFrom Lyndes Physics of the Household, published by The Macmillan Co. In (2), BO is inside the focus; therefore BR and BP divergeafter they pass through the lens and do not form an image. Youreye, however, makes an image because it sees the rays as thoughthey came from MI. This explains why you see anything insidethe focal length as enlarged and right side up. In (3), BO is outside the virtual focus of the diverging and BP diverge after they pass through the lens and youreye sees the
Gilbert light experiments for boys . 110 GILBERT BOY ENGINEERING. (2) (3)Fig. 163. How images are formedFrom Lyndes Physics of the Household, published by The Macmillan Co. In (2), BO is inside the focus; therefore BR and BP divergeafter they pass through the lens and do not form an image. Youreye, however, makes an image because it sees the rays as thoughthey came from MI. This explains why you see anything insidethe focal length as enlarged and right side up. In (3), BO is outside the virtual focus of the diverging and BP diverge after they pass through the lens and youreye sees the image MI. This explains why diverging lensesalways give images small and right side up. POWER OF A LENS Spectacles are lenses, and opticians measure the power of thespectacle lenses as follows: If the lens has a focal length of1 meter it is said to have a power of 1 diopter; if it has a focallength of 1-2, 1-3, or 1-10 meter it is said to have a power of 2, 3,or 10 diopters; and so on. That is, the shorter the focal lengththe greater the power. GILBERT LIGHT EX
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