Question

why are we taking focal length negative

Answer 1

I. In concave mirror focal length is -ve as focus is placed in left hand side

Distance of pole n focus is focal length

2 .in convex mitron f is place at right

placeso it have +ve focal length

Answer 2

I. In concave mirror focal length is -ve as focus is placed in left hand side

Distance of pole n focus is focal length

2 .in convex mitron f is place at right

placeso it have +ve focal length

Answer 3

I. In concave mirror focal length is -ve as focus is placed in left hand side

Distance of pole n focus is focal length

2 .in convex mitron f is place at right

placeso it have +ve focal length