Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 11
this book assume that you have made one. You will find, how-ever, that you can make most of the dark-room experiments inthe dark box. It is an excellent idea to have both. Experiment No. 3. To show that you cannot see a beam oflight unless it falls on some object or directly on your eyes.Darken the… … the slit and ascreen or the wallor floor? Make a dustnear the beam byshaking your coator a carpet. Doyou now appear tosee the beam (Fig.6)? You do, be-cause the dust par- rig. 6. Dust makes the beam visible tides reflect light to your eyes. On a clear night you cannot see the beam from the…
Light · Scientific recreations
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