Question

The time of retention of image in the eye is called _____________.

Answer 1

Explanation

1. The ability of the human eye to retain an image on the retina for some time even removal of the object is called persistence of vision.
2. The time of retention is $\frac{1}{16}th$ of a second.
3. Thus, if objects are flashed in a time period of less than $\frac{1}{16}th$ of a second, then the brain perceives them to be moving.
4. This property of eyes is used largely in cinematography.

Hence, the time of retention of the image in the eye is called persistence of vision.