A compound microscope having - f - 0 -7 mm- - f - e -20mm and the distance between the lenses is 20 cm- If the image is formed least distance of distinct vision then magnifying power -337400220120

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A compound microscope having $f_{0} = 7 m m$ , $f_{e} = 20 m m$ and the distance between the lenses is $20 c m$ . If the image is formed at least distance of distinct vision then magnifying power ?
$337$
$400$
$220$
$120$

220

120

337

400

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A compound microscope having f0=7mm, fe=20mm and the distance between the lenses is 20cm. If the image is formed at least distance of distinct vision then magnifying power ?337400220120

A compound microscope having $f_{0} = 7 m m$ , $f_{e} = 20 m m$ and the distance between the lenses is $20 c m$ . If the image is formed at least distance of distinct vision then magnifying power ?
$337$
$400$
$220$
$120$