A plano convex lens of refractive index μ1 fits exactly into a plano concave lens of refractive index μ2. Their plane surfaces are parallel to each other. If R is radius of curvature of curved surfaces of lenses, focal length of combination is

1f=1f1+1f2=μ1−11R−μ2−11R=μ1−μ2Rf=Rμ1−μ2

A plano convex lens of refractive index μ1 fits exactly into a plano concave lens of refractive index μ2. Their plane surfaces are parallel to each other. If R is radius of curvature of curved surfaces of lenses, focal length of combination is

1f=1f1+1f2=μ1−11R−μ2−11R=μ1−μ2Rf=Rμ1−μ2

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A plano convex lens of refractive index $μ$ ₁ fits exactly into a plano concave lens of refractive index $μ$ ₂. Their plane surfaces are parallel to each other. If R is radius of curvature of curved surfaces of lenses, focal length of combination is

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$\frac{R}{μ_{1} - μ_{2}}$

$\frac{R}{2 (μ_{1} - μ_{2})}$

$\frac{R}{μ_{1} + μ_{2}}$

$\frac{2 R}{μ_{1} - μ_{2}}$

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$\begin{array}{l} \frac{1}{f} = \frac{1}{f_{1}} + \frac{1}{f_{2}} = (μ_{1} - 1) \frac{1}{R} - (μ_{2} - 1) \frac{1}{R} = \frac{(μ_{1} - μ_{2})}{R} \\ f = \frac{R}{μ_{1} - μ_{2}} \end{array}$

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A plano convex lens of refractive index μ1 fits exactly into a plano concave lens of refractive index μ2. Their plane surfaces are parallel to each other. If R is radius of curvature of curved surfaces of lenses, focal length of combination is

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A plano convex lens of refractive index $μ$ ₁ fits exactly into a plano concave lens of refractive index $μ$ ₂. Their plane surfaces are parallel to each other. If R is radius of curvature of curved surfaces of lenses, focal length of combination is