Two refracting media are separated by a spherical interface as shown in the figure. \( A B \) is...

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Two refracting media are separated by a spherical interface as shown in the figure. \( A B \) is the principal axis, \( \mu_{1} \) and \( \mu_{2} \) are the refractive indices of medium of incidence and medium of refraction respectively. Then,
(a) if \( \mu_{2}\mu_{1} \), then there cannot be a real image of real object
(b) if \( \mu_{2}\mu_{1} \), then there cannot be a real image of virtual object
(c) if \( \mu_{1}\mu_{2} \), then there cannot be a real image of virtual object
(d) if \( \mu_{1}\mu_{2} \), then there cannot be a virtual image of virtual object
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