Question

In order to determine the focal length of a concave mirror by obtaining the
image of distant object on screen, the position of screen should be:
(a) Perpendicular to plane of concave mirror
(b) Parallel to plane of concave mirror
(c) Inclined at an angle 60° to plane of mirror
(d) In any direction with respect to the plane of concave mirror​

Answer 1

Answer:

(d) In any direction with respect to the plane of concave mirror

Answer 2

Answer:

(d) in any direction with respect to the plane of concave mirror