1.

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 ?

Answer»

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SOLUTION :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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