When an opticians testing room is small he uses a mirror to help in test the eyesight of patients explain why?

An optician's testing room is often small because it needs to be dark and controlled environment to ensure accurate vision testing. However, a small testing room can make it difficult for the optician to move around and test the patient's vision from different distances.

To overcome this challenge, opticians often use a mirror to help them in testing the eyesight of patients. The mirror allows the optician to sit at a fixed position and still see the patient from different distances.

Here's how the mirror is used:

1. The mirror is placed at the far end of the testing room, opposite the optician's chair.

2. The patient sits facing the mirror, and the optician sits facing the patient.

3. The optician uses a light source to illuminate the eye chart, which is placed on the wall behind the patient.

4. The light from the light source reflects off the mirror and into the patient's eyes.

5. The patient reads the eye chart, and the optician observes the patient's eye movements and responses.

By using the mirror, the optician can see the patient's eyes from different distances, even though they are sitting in a fixed position. This allows the optician to accurately assess the patient's vision and prescribe the appropriate corrective lenses.