A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $\mu $1 and $\mu $2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

Question

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $\mu $₁ and $\mu $₂ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

${R \over {\left( {{\mu _1} - {\mu _2}} \right)}}$

${{2R} \over {\left( {{\mu _2} - {\mu _1}} \right)}}$

${R \over {2\left( {{\mu _1} + {\mu _2}} \right)}}$

${R \over {2\left( {{\mu _1} - {\mu _2}} \right)}}$

Solution

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