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Three lenses having power 2, 2.5 and 1.7...

Three lenses having power 2, 2.5 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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The correct Answer is:
The total power of the combination is 6.2 D.
Given: `P_(1)=2D, P_(2)=2.5 D, P_(3)=1.7D`
To find: Power of combination (P)
Formula: `P=P_(1)+P_(2)+P_(3)`
Calculation: From formula,
`P=2+2.5+1.7=6.2 D`
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