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STD 12 - 9. Ray optics abd optical instruments — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 9. Ray optics abd optical instruments4 Marks
Question
$A$ microscope is focused on a point object and then its objective is raised through a height of $2cm$. If a glass slab of refractive index $1.5$ is placed over this point object such that it is focused again, the thickness of the glass slab is......$cm$
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Answer

$6$

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