Question

If the sign conversation of focal length of concave mirror is negative then why we write positive​

Answer 1

Answer:

Since, object is always placed in front of the mirror hence the sign of object is taken as negative. Since, the centre of curvature and focus lies behind the convex mirror, so sign of radius of curvature and focal length are taken as + (positive) in the case of convex mirror.

HOPE IT'S HELPFUL

Plz mark as BRAINLIEST.

Answer 2

Answer:

f, the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. ... A negative m means that the image is inverted. Positive means an upright image.