An object $2.4\,m$ in front of a lens forms a sharp image on a film $12\,\,cm$ behind the lens. A glass plate $1\,\,cm$ thick, of refractive index ${\rm{1}}{\rm{.50}}$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film

JEE PHYSICS MCQ: RAY OPTICS

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An object

2.4\,m

in front of a lens forms a sharp image on a film

12\,\,cm

behind the lens. A glass plate

1\,\,cm

thick, of refractive index

\mathrm{1}\mathrm{.50}

is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film

View answer and explanation

Correct option: C

3.2\,\,m

Option C (

3.2\,\,m

) is correct because it is the distance the object needs to be shifted to maintain a sharp focus after inserting the glass plate, calculated using the lens formula and the concept of optical path length.

JEE PHYSICS MCQ: RAY OPTICS

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