Four combinations of two thin lenses are given in List I. The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5. Match lens combinations in List I with their focal length in List II and select

Question

Four combinations of two thin lenses are given in List I. The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5. Match lens combinations in List I with their focal length in List II and select the correct answer using the code given below the lists. List I List II A. P . 2 r B. Q . r 2 C. R . - r D. S . r

Quantrex Academy · Accepted Answer

Correct answer: D. a-q;b-s;c-r;d-p;

1 f = 1 f 1 + 1 f 2 Use 1 f e q = 1 f 1 + 1 f 2 P 1 f e q = 1 R + 1 R = 2 R ; f e q = R 2 Q 1 f e q = 1 2 R + 1 2 R = 1 R ; f e q = R R 1 f e q = - 1 2 R - 1 2 R = - 1 R ; f e q = - R S 1 f e q = 1 R - 1 2 R = 1 2 R ; f e q = 2 R

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