Question

But why 'u' &'v' take negative

Answer 1

Answer:

Object distance (u) is taken negative because it is always taken on the left side i.e. on the negative side.

Image distance (v) is taken negative or positive on the basis of the type of mirror or lens taken.

Explanation:

This is because the distance that is on the left side of the mirror or lens is always taken negative whereas on the right side the distance is taken positive.

Hence it also depends on the type of mirror or lens is given.

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