Question

which distance is called object​

Answer 1

Answer:

The distance from object to the lense or mirror is known as object distance

Explanation:

Hope it helps...

Answer 2

$\large\bf\underline\purple{Hey!}$

The object distance is the distance between the object and the lense, or mirror. The object distance is always positive. The (real) image distance is positive on the other side in case of a lense. Only when the image is a virtual one, on the same side of the lense as the object, is the image distance negative.