Gilley, Frank M · Boston, Allyn & Bacon · leaf 277
K. Apparatus: Plane mirror; rubber bands, fastening the mirror in an uprightposition to a block of wood; large sheet of paper; pin. Draw a triangle, ABC, Fig. 236, in front of the mirror. Insert apin at B, or place a block of wood, marked with a vertical line, so that the lower end ofthe line… … Fig. 236. LIGHT— REFLECTION. 267 the image of the pin B. Point the ruler, not at B, but at the imageyou see in the glass. Call the line drawn along the edge of the rulera sight-line. Remove the ruler, and look along the surface of thepaper, to see if the line really points to the image of the pin…
Physics
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