Question

in concave lens focal lenght is always negative pls give me right answer​

Answer 1

Yes negative. ..

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Answer 2

HEY MATE HERE IS YOUR ANSWER......

IN FOAL LENGTH WE USE TO DETERMINE THE SINE BY CARTESIAN PLANE.

YOU HAVE A BETTER EXAMPLE CONCAVE MEANS CAVE.

WHEN YOU WERE ASKED TO GO IN THE CAVE.,,,

YOU MIGHT HAVE MANY NEGATIVE THOUGHTS....

SO CONCAVE ----- CAVE MEANS NEGATIVE THOUGHTS...

SO, FOCAL LENGTH WILL BE NEGATIVE WITH V&U.... BUT V WAS NOT ALWAYS NEGATIVE IT WOULD BE POSITIVE OR NEGATIVE ACCORDING TO QUESTION.

HOPE THIS HELPS....