Question

For a real object placed in front of a spherical mirror, the object distance u is:

Options

• Always negative

• Equal to the focal length of the mirror

• Positive for a concave mirror and negative for a convex mirror

• Always positive

Answer 1

Distances measured from the pole opposite to the direction of the incident light are negative. A real object placed in front of the mirror lies on this side, so its distance u is always negative.