A simple microscope has a magnifying power of 3.0 when the image in formed at the near point (25 cm) of a normal eye. What is its focal length?

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Solution

Given:
m=3, D = 25 cm

We have the magnifying power formula as below:
m=1+D/f

Putting the values, we get f = 12.5 cm

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A simple microscope has a magnifying power of 3.0 when the image in formed at the near point (25 cm) of a normal eye. What is its focal length?

Given: m=3, D = 25 cm We have the magnifying power formula as below: m=1+D/f Putting the values, we get f = 12.5 cm

Given:
m=3, D = 25 cm

We have the magnifying power formula as below:
m=1+D/f

Putting the values, we get f = 12.5 cm