A thin converging lens has a power of 4 0 diopt... - JAMB Physics 2005 Question
A thin converging lens has a power of 4.0 diopters determined its focal length.
A
2.50m
B
0.03m
C
5.00m
D
0.25m
correct option: d
the power of a lens is defined as the reciprocal of the focal length ,expressed in metre.Mathematically, the power of a lens in dioptres is given by:(100)/f(in cm).
thus for lens of power of 4.0 dioptres we have that: (100)/(f) = +4.0
f= (100)/(4.0) = 25cm
= 0.25cm
thus for lens of power of 4.0 dioptres we have that: (100)/(f) = +4.0
f= (100)/(4.0) = 25cm
= 0.25cm
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