Question

convex lens is in contact with concave lens. The magnitude of the ratio of their focal length

is

2

.

3

Their equivalent focal length is 30 cm. What are their individual focal lengths (in cm).​

Answer 1

Hlew,

Here's your answer...

As ratio of their focal lengths 2:3=>one being 2x the other 3x.Then the relation for combined focal length as (1/F)={(1/F1)+(1/F2)}

=>1/30={1/(2x)+1/(-3x)}=>1/30=1/(6x)

=>x=5cm,so individual focal lengths are 2×5,3×5

Or 10cm and -15cm respectively.

Thanks.

Sorry baby 'wink'

Answer 2

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