Find the focal length of a concave lens of a power _2.5 d
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P = 1/f (in m) or 100 /f (in cm)
-2.5 = 100/f
-2.5f= 100
f= 100/-2.5= -40cm or - 0.4 m
hope it helps.
-2.5 = 100/f
-2.5f= 100
f= 100/-2.5= -40cm or - 0.4 m
hope it helps.
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