two lens have power of a) +2 b) -4D what is the nature of focal length of each lens
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what is going on here I don't know sorry my dear I am not sure if you are aware from me
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power of a lens is the reciprocal of its focal length
power = 1/ focal length
therefore focal length = 1/ power
focal length of. lens a = 1/2 = 0.5 m
focal length of b = 1/-4 = - 0.25m
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