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Light Reflection and Refraction
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23/08/2021 8:09 pm
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The power of a lens is + 0.2 D. Calculate its focal length.
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23/08/2021 8:10 pm
P = +0.2 D.
P = \(\frac{1}{f}\)
f = \(\frac{1}{P}\) = \(\frac{1}{0.2}\)
= +5 m.