question_answer

A plano convex lens of refractive index \[{{\mu }_{1}}\] and focal, length \[{{f}_{1}}\] is kept in contact with another piano concave lens of refractive index \[{{\mu }_{2}}\]and focal length\[{{f}_{2}}\]. 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- [JEE Main 10-Jan-2019 Morning]

A) \[3{{\mu }_{2}}-2{{\mu }_{1}}=1\]

B) \[{{\mu }_{1}}+{{\mu }_{2}}=3\]

C) \[2{{\mu }_{1}}-{{\mu }_{2}}=1\]

D) \[2{{\mu }_{2}}-{{\mu }_{1}}=1\]

Correct Answer: C

Solution :

[c]