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- Rμ1−μ2
- 2Rμ2−μ1
- R2(μ1−μ2)
- R2−(μ1+μ2)

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Solution

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Lens maker formula: 1f=(μ−1)(1R1−1R2) .......(1)

Using (1), 1f1=(μ1−1)(1∞−1−R) ⟹1f1=μ1−1R

For Plano-concave lens: R1=−R R2=∞

Using (2), 1f2=(μ2−1)(1−R−1∞) ⟹1f2=1−μ2R

Thus focal length of combination, 1F=1f1+1f2=μ1−1R+1−μ2R

⟹ F=Rμ1−μ2

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