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two thin lenses of focal length 10cm and 20cm are placed in contract calculate the effective power of the combination​

Sagot :

Answer:

20/3

Explanation:

We can use the formula : 1/R1 + 1/R2 = 1/f here
Therefore 1/10 + 1/20 = 3/20
And as it is 1/f its reciprocal will be 20/3

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