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WARRIOR [948]
3 years ago
5

What power lens should he use as a magnifier to see clearly at a distance of 15 cm without wearing his glasses?

Biology
1 answer:
djyliett [7]3 years ago
4 0
<span>The focal length of the combination is given by 1/ f combination (1/fc ) = 1/f + 1/Fm </span>

<span>Assuming the the near point is 30 cm </span>

<span>1/f = 1/30 + 1/v </span>

<span>At 15 cm </span>

<span>1/fc = 1/15 + 1/v </span>

<span>1/fc = 1/15 + 1/f – 1/30 </span>

<span>1/fc – 1/f = 1/30 </span>

<span>1/f + 1/Fm – 1/f = 1/30 </span>

<span>1/Fm = 1/30 </span>

<span>Fm = 30 cm

Hope this answers. Have a nice day.</span>
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