Two convex lenses of focal lengths ${\rm{0}}.{\rm{03}}\,\,{\rm{m}}\,\,{\mkern 1mu} {\rm{and}}\,\,{\mkern 1mu} {\rm{0}}.{\rm{05}}\,\,{\rm{m}}$ are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is

${\rm{0}}{\rm{.35}}\,\,{\rm{cm}}$

${\rm{0}}{\rm{.25}}\,\,{\rm{cm}}$

${\rm{0}}{\rm{.175 }}\,{\rm{m}}$

${\rm{0}}{\rm{.15 }}\,{\rm{m}}$

JEE PHYSICS MCQ: RAY OPTICS

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Application +4 | -1

Two convex lenses of focal lengths

\mathrm{0}.\mathrm{03}\,\,\mathrm{m}\,\,{\mkern 1mu} \mathrm{and}\,\,{\mkern 1mu} \mathrm{0}.\mathrm{05}\,\,\mathrm{m}

are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is

View answer and explanation

Correct option: A

\mathrm{0}\mathrm{.35}\,\,\mathrm{cm}

Option A (0.35 m) is correct because the distance between the lenses in a telescope adjusted for infinity is the sum of their focal lengths.