Question

give a relation between object distance, image distance ,focal length of a concave mirror.

Answer 1

Object distance means what is the distance between pole and object. Image distance means when image is formed then the distance between pole and image is called image distance. Focal length is the distance between pole and the principal focus of the mirror.

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Answer 2

1/f=1/v + 1/u where f is the focal length u is the object distance and v is the images distance it is the right answer