Question

# A combination of two lenses with power 1D and 2D is there. What is the total power?

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Solution

## Step 1: Given data:Power of Lenses in contactThe power of n number of lenses in contact is equal to the algebraic sum of the power of n individual lenses.Given, Powers, ${P}_{1}=1D\phantom{\rule{0ex}{0ex}}{P}_{2}=2D$Step 2: Calculation:So, $P={P}_{1}+{P}_{2}\phantom{\rule{0ex}{0ex}}P=1+2\phantom{\rule{0ex}{0ex}}P=3D$ Here, P is total power.Hence, the total power of a combination of two lenses with power 1D and 2D is 3D.

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