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  4. Two lenses of power +12 and -2 dioptres are placed in contact. The combined focal length of the combination will be

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Q. Two lenses of power $+12$ and $-2$ dioptres are placed in contact. The combined focal length of the combination will be

Ray Optics and Optical Instruments

Solution:

$P=P_{1}+P_{2}$
$=+12-2=10 D$
Now $F=\frac{1}{P}=\frac{1}{10} m=10 \,cm .$