metres. Move the screen to the second mark75 cm. from the source; the patch of light will be found tohave increased in area and will now be 3x2-5 or 75 cm.across, thus the diameter of the patch is in all cases propor-tional to the distance of the screen from the source; thebounding rays of light… … of 1 cm. from a source 0, the rays from 0 fall on this aperturevery nearly normally and pass through it. Consider a screen2 cm. from 0, the breadth of the patch of light formed on 14 LIGHT. [CH. I this screen is as we have seen from the above experimenttwice that of the aperture; its area therefore…
Heat · Light
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