Determine the focal length of a thin converging lens if t...
Determine the focal length of a thin converging lens if the power is 5.0 dioptres
0.1 m
0.2 m
2.0 m
2.5 m
Correct answer is B
Power of a lens = 1f
f = focal length
f = 1p
= 15
= 0.2m