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Three lenses having powers 2 D, 2.5 D a...

Three lenses having powers 2 D, 2.5 D and 1.7 D are kept touching in a row. What is the total power of the lens combination ?

Text Solution

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Total power of the lens combination .
` P = P_(1) + P_(2) + P_(3)`
` = 2 D + 2. 5 D + 1.7 D`
6.2 D
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