Out of the following, the best way to do the experiment on finding the focal length of a concave mirror by obtaining the image of a distant object is to:
(a) keep both the mirror and the screen in suitable stands with the screen put behind the mirror
(b) keep both the mirror and screen in suitable stands with the screen put in front of the mirror.
(c) hold the mirror in hand and keep the screen in a stand kept behind the mirror
(d) hold the mirror in a stand and hold the screen in hand, with the screen in front of the mirror
Plz help with this Class XIII question.