Given figures show the arrangements of two lenses, The radii of curvature of all the curved surfaces are same. The ratio of the equivalent focal length of combinations P,Q and R is

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1 : 1 : 1

1 : 2 : -1

2 : 1 : 1

2 : 1 : 2

answer is A.

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Detailed Solution

In given images, P,Q and R lenses in contact for P combination of lenses
$\frac{1}{F_{P}} = \frac{1}{f} + \frac{1}{f} = \frac{2}{f}$
Similarly for Q and R combination
$\begin{array}{l} F_{Q} = \frac{f}{2} \\ F_{R} = \frac{f}{2} \\ T h e P : Q : R = 1 : 1 : 1 \end{array}$

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