Question

A concave mirror has a focal length 20 cm. The distance between the two positions of object for which the image size is double of object size.

Answer 1

For the Image to be double in size the object should be placed between 20cm (after F ). i.e at F or between F and Pole

Answer 2

HIII .....

HERE IS YOUR ANSWER:--------

FOR THE IMAGE TO BE DOUBLED IN SIZE THE OBJECT SHOULD BE PLACED BETWEEN 20CM AT OR BETWEEN F AND POLE.

HOPE THIS HELPS YOU....