Two this lenses, when in contact, produce a combination of power `+10` diopters. When they are 0.25 m apart, the power reduces to `+6` diopters. The focal length of the lenses are…. `m` and …`m`.
A. 0.125 and 0.5
B. 0.125 and 0.125
C. 0.5 and 0.75
D. 0.125 and 0.75