An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens.

Question:

An object $2.4 \mathrm{~m}$ in front of a lens forms a sharp image on a film $12 \mathrm{~cm}$ behind the lens. A glass plate $1 \mathrm{~cm}$ thick, of refractive index $1.50$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object be shifted to be in sharp focus on film ?

  1. $5.6 \mathrm{~m}$

  2. $7.2 \mathrm{~m}$

  3. $2.4 \mathrm{~m}$

  4. $3.2 \mathrm{~m}$


Correct Option: 1

Solution:

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