Using the lens maker formula, relate the focal length of thin lens in List-I with value in List-II. (Consider positive for converging and negative for diverging.)

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f 1 ​ = ( μ M ​ μ L ​ ​ − 1 ) ( R 1 ​ 1 ​ − R 2 ​ 1 ​ ) for plane surface, R → ∞ 1 → f 1 ​ = 2 1 ​ × R 1 ​ ⇒ f = 2 R 2 → f = 4 R 3 → f 2 ​ 1 ​ = ( 4 3 ​ − 1 ) ( R 2 ​ ) ⇒ f = − 2 R 4 → f 2 ​ 1 ​ = ( 2 3 ​ × 4 3 ​ − 1 ) − R 2 ​ ⇒ f = − 4 R

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