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Question

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

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Solution

Given:
P1=2D,P2=2.5 D,P3=1.7 D
Let the total power of the lens combination be P. Thus,
P=P1+P2+P3=2+2.5+1.7=6.2 D

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