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A plano convex lens of refractive index \( \mu_{1} \) and
\( \mathrm{P} \) focal length \( f_{1} \) is kept in contact with another plano concave lens of refractive index \( \mu_{2} \) and focal length
W \( f_{2} \). If the radius of curvature of their spherical faces is \( R \) each and \( f_{1}=2 f_{2} \), then \( \mu_{1} \) and \( \mu_{2} \) are related as
(a) \( 3 \mu_{2}-2 \mu_{1}=1 \)
(b) \( \mu_{1}+\mu_{2}=3 \)
(c) \( 2 \mu_{1}-\mu_{2}=1 \)
(d) \( 2 \mu_{2}-\mu_{1}=1 \)
(JEE Main)
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