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Light Reflection and Refraction
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23/08/2021 8:11 pm
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The power of a lens is, -2D. What is its focal length?
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23/08/2021 8:12 pm
P = -2 D
P = \(\frac{1}{f}\)
f = \(\frac{1}{P}\) = \(\frac{1}{-2}\)
= -0.5 m = -50 cm