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  4. A lens of power +3.5 diopters is placed in contact with a lens of power -2.5 diopter. The combination will behave like:

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Q. A lens of power +3.5 diopters is placed in contact with a lens of power -2.5 diopter. The combination will behave like:

Ray Optics and Optical Instruments

Solution:

$P = P _{1}+ P _{2}=+2-1=+1$ diopter, lens behaves as convergent $
F =\frac{1}{ P }=\frac{1}{1}=1 m =100 cm
$