The diagram below shows a patient having her eyes tested.a chart with letters is placed behind her & she sees the chart reflected in a plane mirror the patient is told to move 0.5m ?

The patient is asked to move 0.5m closer to the mirror in order to test her eyesight. This change in distance may help the optometrist determine the patient's visual acuity and prescription for corrective lenses.

The patient is told to move 0.5m away from the mirror.