Why do we take take the focal length of concave lens as negative and that of convex as positive?
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It's taken according to New Cartesian sign convention.
Anonymous:
But according to it only the RHS and upside digits should be taken as positive
And in lens 2 sides are there then how can we judge which is positive and which is negative
u judge my taking positive along the direction of light ray and negative against
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its bcz concave lens gives us inverted image and convex mirror gives us erect image
its just one way to ans
It's opp.
Convex gives us inverted and concave erect
And one is lens other is mirror??
i told fr mirror
check my cmmnt in other one
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