Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 325
n.The reason for the image being inverted and for its be-ing more or less indistinct will be seen from a study ofthe figure. Light from the tip of the flame a will fallupon the screen at a and will cover an area somewhatlarger than the hole c d. Likewise a point, b, at the baseof the flame, will… … Fig. 202.—Light through small apertures. neighboring points in the flame. Hence the image ismore or less indistinct. When a pencil, or similar object,is passed downward between the flame and c d, the shadowof the pencil moves upward upon the screen, and vice versa ;also when the pencil is moved…
Physics
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