Question

what is the cartesian Sign conventio
used for lenses ?
state with figure​

Answer 1

Answer:

let us take as an example an object 10 cm to the left of a converging lens of focal length 5 cm. In this case the object distance is l (lower case L) and is negative, as it is to the left of the "origin" of the axes. The focal length of the lens is positive.

Answer 2

Answer:

According to the sign convention, a convex lens focal length is positive, whereas a concave lens focal length is negative. The incident light always moves from left to right because the object is always on the lens's left side.

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