The power of the convex lens when it is made of material having refractive index (n2= 2) and kept in
air (n1 = 1) is equal to
a)40÷3D
b)-40÷3D
c)80÷3D
d)-80÷3D
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40÷you know se and I have 4AM 6inches in the same place but..........youar I am a little worried that the
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