Gilbert light experiments for boys . t di-verged or spread? ExperimentNo. 100. Focal your shutter, Fig. 158. You measure the focal length focus the light with a converging lens, holda piece of paper at the point where you get the smallest andbrightest image of the sun (Fig. 158) and measure the distancefrom the lens to the paper. The point is the focus and the dis-tance is the focal length of the lens. Repeat with the other converging lens. £)o you find the focal lengths of the lenses to be 4 inchesand 8 inches respectively? Experiment No. 101. Focal length of diverging lens. Pu
Gilbert light experiments for boys . t di-verged or spread? ExperimentNo. 100. Focal your shutter, Fig. 158. You measure the focal length focus the light with a converging lens, holda piece of paper at the point where you get the smallest andbrightest image of the sun (Fig. 158) and measure the distancefrom the lens to the paper. The point is the focus and the dis-tance is the focal length of the lens. Repeat with the other converging lens. £)o you find the focal lengths of the lenses to be 4 inchesand 8 inches respectively? Experiment No. 101. Focal length of diverging lens. Punchtwo nail holes exactly 1 inch apart in a piece of paper, put thisin front of the diverging lens, and measure the distance at whichthe spots of sunlight appear 2 inches apart on a paper behindthe lens. This is thevirtual focal it 4 inches? ExperimentNo. 102. Is it hot?Put your hand at thefocus of each converg-ing lens in turn (). Is the sunlighthot? It is, because all the light and heat Fig. 159. The focus is hot.
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