JAMB - Physics (2017 - No. 25)
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
説明
Power of a lens = \(\frac{1}{f}\)
f = focal length
f = \(\frac{1}{p}\)
= \(\frac{1}{5}\)
= 0.2m
f = focal length
f = \(\frac{1}{p}\)
= \(\frac{1}{5}\)
= 0.2m