Question

The power of two lense are in the ratio 4:1 , what would be the ratio of focal length of these lens ?
$quick$
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Answer 1

Answer:

the ratio of focal length of these lens is 1:4 as

power =1/focal length

Answer 2

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▪︎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