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f=1/2=0.5(converging lens)

(ii) -4=1/f

f=1/-4= -1/4=0.25

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(A)Power of a lens= 1/focal length-------------- f=1/2=0.5. As the power is given in +ve sign, it is a concex lens--------------------(b) p=1/f------------- f=1/4= 0.25. -- as the power is in -ve , it is a concave lens
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