Rohan's _______ cannot be a part of his family tree.
Rohan stands in front of a mirror at different distances; still his image always appears erect. The mirror can be a ____________.
Rohan is taking a brisk walk towards a mirror at 2.5 m/s. At an instance, he finds his image to be at a distance of 16 m from him. How far will be the mirror from Rohan after 2 seconds?