A plano-convex lens (focal length \( f_{2} \), refractive index \( \mu_{2} \), radius of curvatu...

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A plano-convex lens (focal length \( f_{2} \), refractive index \( \mu_{2} \), radius of curvature \( R \) ) fits exactly into a plano-concave lens
P (focal length \( f_{1} \), refractive index \( \mu_{1} \), radius of curvature \( R \) ).

W Their plane surfaces are parallel to each other. Then, the focal length of the combination will be (2019 Main, 12 Jan II)
(a) \( f_{1}-f_{2} \)
(b) \( \frac{R}{\mu_{2}-\mu_{1}} \)
(c) \( f_{1}+f_{2} \)
(d) \( \frac{2 f_{1} f_{2}}{f_{1}+f_{2}} \)
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