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If \(f=0.5\;\text{m}\)  for a glass lens, what is the power of the lens?

Answer

Given data, \(f=0.5\;\text{m}\)
Power of lens,
\(P=\frac 1{f\left( \text{meter}\right)}\)  
\(=\frac 1{0.5}\)  
\(=0.2\;\text{Dioptre}\)
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