The value of the of `d_(1)` and `d_(2)` for final rays to be parallel to the principle axis are (focal lengths of the lenses are written on the lenses).
A. `d_(1) =10 cm, d_(2) = 15 cm`
B. `d_(1) = 20 cm, d_(2) = 15 cm `
C. `d_(1) = 30 cm, d_(2) = 15 cm `
D. All of these
