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.

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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 _ eq = 1 f _ 1 + 1 f _ 2 (P) 1 f _ eq = (1)/(R) + (1)/(R) = (2)/(R); f _ eq = (R)/(2) (Q) 1 f _ eq = (1)/(2R) + (1)/(2R) = (1)/(R); f _ eq = R (R)1 f _ eq = - (1)/(2R) - (1)/(2R) = - (1)/(R); f _ eq = - R (S)1 f _ eq = (1)/(R) - (1)/(2R) = (1)/(2R); f _ eq = 2R

	List I		List II
A.		$P .$	$2r$
B.		$Q .$	$\dfrac{r}{2}$
C.		$R .$	$- r$
D.		$S .$	$r$

Four combinations of two thin lenses are given in List I. The...

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