Question

If the ratio of the power of the lenses is 4:1 , what should be the ratio of their focal length ? *​

Answer 1

P of first lense = 4x

P of second lense = 1x

We know that power is the reciprocal of focal length......

So, F of first lense = 1/4x

F of second lense = 1/x

Thus their ratio is 1:4

Answer 2

$\Huge\boxed{\underline{\underline{\tt{\blue{Answer !!}}}}}$

▪︎P of first lense = 4x

▪︎P of second lense = 1x

☆We know that power is the reciprocal of focal length.....

▪︎So, F of first lense = 1/4x

▪︎F of second lense = 1/x

☆Thus their ratio is 1:4