Curved surfaces of a plano-convex lens of refractive index $\mu$1 and a plano-concave lens of refractive index $\mu$2 have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.

Question

Curved surfaces of a plano-convex lens of refractive index $\mu$₁ and a plano-concave lens of refractive index $\mu$₂ have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.

${1 \over {{\mu _2} - {\mu _1}}}$

${\mu _1} - {\mu _2}$

${1 \over {{\mu _1} - {\mu _2}}}$

${\mu _2} - {\mu _1}$

Solution

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