Question

if Radius = 20cm find focal length

Chapter -- Light ( class 10)

Answer 1

HOLA

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$f \: = \: \frac{r}{2} \\ \\ r \: = \: 20 \\ \\ f \: = \: \frac{20}{2} = 10 \\ \\ f \: = \: 10$

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Answer 2

Answer:

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