Power of a lens:

$\overline{){\mathbf{D}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{f}}}$

We need two lenses with the greatest power.

Power is inversely proportional to the focal length.

Thus, they should have the least focal length.

You have lenses with the following focal lengths: f = 25 mm, 50 mm, 100 mm, and 200 mm.

Which pair of lenses would you use to get the highest-power microscope? Check all that apply. 25 mm 50 mm 100 mm 200 mm

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