Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 69
you find it to be about two inches ? Experiment No. 61. Focal length of convex mirror. Maketwo pencil dots just 2 inches apart on a piece of cardboard andbetween these punch two holes just 1 inch apart. Hold thecardboard between the convex mirror and the sun and move ituntil the light which passes… … Fig. 100. You find the focus hot GILBERT LIGHT EXPERIMENTS 67 length of the convexmirror. Do you findit to be 2 inches? There is no realfocus for a convexmirror because itspreads the light, butthe reflected rays ap-pear to come from apoint 2 inches behind
Light · Scientific recreations
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