Question

Why optician's use plane mirror?

• A. to use lateral inverted images.
• B. to increase intensity of light entering the eye.
• C. to increase effective length between object and image.
• D. All of the above

Answer 1

The correct option is C

to increase effective length between object and image.

To test myopia or hypermetropia, opticians generally use plane mirror. This is generally because the distance between object and image becomes twice the distance between object and mirror. Hence to increase effective length between object and image optician's use plane mirror.