A student can distinctly see the object upto a distance `15 cm`. He wants to see the black board at a distance of `3m`. Focal length and power of lens used respectively will be

Options

A. - 4.8 cm, -3.3 D
B. - 5.8 cm, -4.3 D
C. -7.5 cm, -6.3 D
D. - 15.8 cm, - 6.3 D

Answer

D