A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 349
cres-cent; at C it would be aeemi-circle; at D it would approach to a circle; and at E the circlewould be complete. The phenomena would be repeated, but in What will be its form,one ? What is meant by a penumbra ? Explain it by diagram. What is the form of the umbra, or proper shadow in eclipses of… … if the opaque body be larger than the luminous REFLECTION OF LIGHT. 34? inverse order, in proceeding- through the opposite positions, fromE to A. The extent of the enlightened part visible from the pointO, is determined by the tangents drawn from the small sphere tothe points L and 0 : thus a b…
Physics
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