The focal lengths of the objective and eyelenses of a microscope are ${\rm{1}}{\rm{.6 }}\,{\rm{cm}}$ and ${\rm{2}}{\rm{.5 }}\,{\rm{cm}}$ respectively. The distance between the two lenses is ${\rm{21}}{\rm{.7 }}\,{\rm{cm}}$. If the final image is formed at infinity, the distance between the object and the objective lens is

${\rm{1}}{\rm{.75 }}\,{\rm{cm}}$

${\rm{1}}{\rm{.8 }}\,{\rm{cm}}$

${\rm{1}}{\rm{.70 }}\,{\rm{cm}}$

${\rm{1}}{\rm{.65 }}\,{\rm{cm}}$

JEE PHYSICS MCQ: RAY OPTICS

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Application +4 | -1

The focal lengths of the objective and eyelenses of a microscope are

\mathrm{1}\mathrm{.6 }\,\mathrm{cm}

and

\mathrm{2}\mathrm{.5 }\,\mathrm{cm}

respectively. The distance between the two lenses is

\mathrm{21}\mathrm{.7 }\,\mathrm{cm}

. If the final image is formed at infinity, the distance between the object and the objective lens is

View answer and explanation

Correct option: D

\mathrm{1}\mathrm{.75 }\,\mathrm{cm}

Option D (

\mathrm{1}\mathrm{.75 }\,\mathrm{cm}

) is correct because it is calculated using the lens formula and the given distances between the lenses and the focal lengths.