Where would an object be placed in a medium of refractive index \( n_{1} \) so that its real ima...

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Where would an object be placed in a medium of refractive index \( n_{1} \) so that its real image is formed at equidistant from the sphere of radius \( R \) and refractive index \( n_{2} \) which is also placed in the medium of refractive index \( n_{1} \) as shown in the below figure?
(A) \( \left(\frac{n_{2}-n_{1}}{n_{2}+n_{1}}\right) R \)
(B) \( \left(\frac{n_{2}}{n_{2}-n_{1}}\right) R \)
(C) \( \left(\frac{n_{1}}{n_{2}-n_{1}}\right) R \)
(D) None of these
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