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Thursday, July 10, 2008

Unusual magnification


Make a small hole in a card with a needle. Hold it close to the eye and look through it. If you bring a newspaper very close you will see, to your surprise, the type much larger and clearer.

This phenomenon is caused in the first place by the refraction of light. The light rays passing through the small hole are made to spread out, and so the letters appear larger. The sharpness of the image is caused - as in a camera- by-the shuttering effect of the small opening. The part of the light radiation which would make the image blurred is held back?

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