Focus Definition and 203 Threads

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  1. Ivan Seeking

    Is Bush's Vision for Space Exploration Grounded by Budget Cuts?

    http://www.nature.com/news/2004/040719/full/040719-19.html
  2. N

    Will a Lens's Focal Point Change in Water?

    what is the definiton of focus?if i put a converging lens or diverging lens in water,will the focus change? do you guys have msn? i have one.
  3. N

    How can we find the focus in a lens

    how can we find the focus ?thanks
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