Question

Question #f550f

Answer 1

`1/v-1/u=1/f`
Here , `f` is taken Positive for a Convex Lens
and is Negative for a Concave Lens

Explanation:

According to lens formula:-

`1/v-1/u=1/f`

Where:-

`v` is the image distance from the lens

`u` is the object distance from the lens

`f` is the Focal length of the lens

NOTE:-

1. All the distances are measured from the Optical Center.

2. Distance measured in the direction of incident light ray is taken as Positive and vice- versa .

For Example ,In this case

`u` is taken as Negative

`v` is taken as Positive

`f` is taken as Positive