An object is kept at a distance of ${\rm{16}}\,\,{\rm{cm}}$ from a thin lens and the image formed is real. If the object is kept at a distance of ${\rm{6}}\,\,{\rm{cm}}$ from the same lens, the image formed is virtual. If the sizes of the images formed are equal the focal length of the lens will be

JEE PHYSICS MCQ: RAY OPTICS

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An object is kept at a distance of

\mathrm{16}\,\,\mathrm{cm}

from a thin lens and the image formed is real. If the object is kept at a distance of

\mathrm{6}\,\,\mathrm{cm}

from the same lens, the image formed is virtual. If the sizes of the images formed are equal the focal length of the lens will be

View answer and explanation

Correct option: B

\mathrm{11}\,\,\mathrm{cm}

Option B (

\mathrm{11}\,\mathrm{cm}

) is correct because the focal length is found by using the lens formula and the magnification for both real and virtual images.