Gilbert light experiments for boys . ge and objects are at equaldistances from the mirror, asfollows: The waves of light from thecandle A strike the mirror as in1, Fig. 57, and are reflected as in 2. The curvature, of the waves is exactly reversed by reflec-tion. The eye estimates the distance of an object partly by thecurvature of the waves which enter it, and the image appears atB as far behind the mirror as the object at A is in front, becausethe reflected waves which enter the eye have exactly the curva-ture they would have if the mirror were absent and the objectwere at B. We see, then, t
Gilbert light experiments for boys . ge and objects are at equaldistances from the mirror, asfollows: The waves of light from thecandle A strike the mirror as in1, Fig. 57, and are reflected as in 2. The curvature, of the waves is exactly reversed by reflec-tion. The eye estimates the distance of an object partly by thecurvature of the waves which enter it, and the image appears atB as far behind the mirror as the object at A is in front, becausethe reflected waves which enter the eye have exactly the curva-ture they would have if the mirror were absent and the objectwere at B. We see, then, that the image of A is at an equal distance Bbecause the waves from A are reversed by the mirror but un-altered in any otherway. Experiment No. 30. To illustrate reflectedwaves. Fill with wa-ter a cake tin with flatsides (Fig. 58), placeit near a good light,dip a pencil in, twoinches from one 58. You see circular waves reflected Is the reflected wave . 4k ?f : 4 ?ppp :. : ;.:-V,/ % , ~~ J 36 GILBERT BOY ENGINEERING. Fig. 59. Your right hand is an image of your leftand vice versa curved in the oppositedirection to the orig-inal wave? Is itlarger and is it thesize it would be if itcame from a point atan equal distance out-side the pan? This iswhat happens when alight wave strikes amirror. Experiment No. 31. Why your image is reversed. Hold your two hands in front ofyou (Fig. 59). Is one a reversed image of the other? Hold your left hand in front of a mirror (Fig. 60). Does itappear to be your right hand? It does, because each point ofthe image is the same distance behind the mirror that the corre-sponding part of the left hand is in front. Experiment No. 32. Reversed words. Print such words asSTAR, STUN, and TOP on paper and look at their images(Fig. 61). Are they reversed? Why? Experiment No. a blotting pa-per. Write a sentencein ink, blot it on freshblotting paper. Tryto read it. It is it in the mirror(Fig. 62). Is it easy?Why? Experiment No. 34
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation
