A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 593
convex mirror / and r are ralways negative ; .. / = ~ = - 30. Ill 1.1 1 v u f v 4.0 «jU 1 JL_ 1 ~4-3= _!_ v~ 30 40~ 120 120 120 .„.-. v= —=-= -171 cm. 7 That is, the image is at a distance of 17 14 cm. behind the mirror. 568 LIGHT CHAP. Object and image not points,—When the object is not a pointit… … Fig. 516.—Production of image by concave mirror. infinite number of rays leave A, fall upon the mirror, and after reflec-tion pass through some focus ; from these, any rays may be chosen.Consider a ray AE, parallel to the principal axis ; it passes, afterreflection, through F, the principal focus.…
Physics
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