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Given a thin convex lens (refractive index μ 2 ), kept in a liquid (refractive index μ 1 , μ 1 < μ 2 ) having radii of curvature |R 1 | and |R 2 |. Its second surface is silver polished. Where should an object be placed on the optic axis so that a real and inverted image is formed at the same place ?

1. | R | μ |) R | | R (| μ | R | . | R | μ 1 1 2 1 2 2 1 1 − +
2. | R | μ |) R | | R (| μ | R | . | R | μ 2 1 2 1 2 2 1 1 − +
3. | R | . | R | μ |) R | | R | 2 ( μ | R | . | R | μ 2 1 1 2 1 2 2 1 1 − +
4. ) μ μ ( | R | ) μ μ ( 1 2 1 1 2 − +

Correct answer: | R | μ |) R | | R (| μ | R | . | R | μ 2 1 2 1 2 2 1 1 − +

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