Question

Power of combination of lenses A nd B is 5D. If the focal length of lens A is o.15 find the power and focal lenght of lens B

Answer 1

The combined Power of lenses = P of A + P of B = 5D

Power of A = 1/f
= 1/0.15
=100/15
=20/3
=6.6 D

Power of lens B :
= 5D - 6.6D.
= -1.6 D


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