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Q.

Two lenses of power +12 and – 2 diopters are placed in contact. What will the focal length of combination?

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a

16.6 cm

b

12.5 cm

c

 8.33 cm 

d

10 cm

answer is A.

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Detailed Solution

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Power of the combination  P=P1+P2=12−2=10

∴ Focal length of the combination  F=100P=10010=10cm

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