Question

Two thin biconvex lens of focal length 10 cm each are placed adjacent to each other, then the power of the combination of the lenses in diopter is​

Answer 1

Answer:

The resulting power of the combination of the lenses will be 20D.

Explanation:

The two thin biconvex lenses of the given focal length 10 cm each are placed next to each other. The power of the resulting combination will be given as per the following formula:

$P_{T} = P_{1} + P_{2}$

We have the focal length $f_{1} = 10 cm$ $=\frac{10}{100} m$

$P_{1} =\frac{1}{f_{1} }$

$P_{1}$$= \frac{100}{10}$$= 10D$

Similarly, we get $P_{2} = 10 D$

The resulting power of the combination will be

$P_{T} = P_{1} + P_{2}$

$P_{T} = 10 D + 10 D =20D$

Therefore we get the resulting power of the combination be 20D.