Question

what is the function of iris ? what is persistence of vision?​

Answer 1

Answer:

Persistence of Vision. An image stays on the retina for about 1/16 of a second. This feature is called persistence of vision. Due to this, when many still images are shown in a sequence; they give the illusion of moving images.

Answer 2

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Function of Iris:

➣The function of the iris in the eye is to control the amount of light that reaches the retina.

➣It does this by changing the size of the pupil, the transparent window that allows light into the eye's interior.

➣It controls light levels inside the eye similar to the aperture on a camera.

➣The round opening in the centre of the iris is called the pupil. The iris is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size.

persistence of vision:

The image formed on the retina of the eye does not fade away instantaneously but its impression remains on the retina for about 1/16th of a second, even after the removal of an object. This is called as persistence of vision. This property is used in cinematography.

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