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At what distance from a simple microscope must an object be placed so that the...

Physics
WAEC 1997

At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?

  • A. 2cm
  • B. 3.3cm
  • C. 4cm
  • D. 5cm
  • E. 15cm
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Correct Answer: Option C
Explanation

M=\(\frac {v}{u}\) = 5

 v = 5u

But, v = 20, 

V = 5u = 20

u = \(\frac{20}{5}\) = 4 cm.

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