Question

linear magnification in concave mirror is positive if object is kept between​

Answer 1

Explanation:

Linear magnification is given as Image size/ Object size

For calculations of magnification, values of image size and object size are taken with proper sign convention.

For an inverted image, the image size is taken as negative and hence magnification is negative.

Answer 2

Answer:

if the object kept between the principal focus and the pole then the image would be formed behind the mirror and it gets the linear magnification in concave mirror is positive