Question

5.
Define the terms:
(a) Blind spot on the retina
(b) Persistence of vision of human eye class 8​

Answer 1

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ʀᴇǫᴜɪʀᴇᴅ ᴀɴsᴡᴇʀ-:

Correct question:

Define the terms-:

(a) Blind spot on the retina.

(b) Persistence of vision of human eye (class 8)

Solution:

(a) Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.

(b) Persistence of vision is a phenomenon of the eye by which an image is thought to persist for about twenty fifth part of a second on retina after the actual image is formed. It is believed to be the explanation for motion perception in cinema and animated films.

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Answer 2

Answer:

Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.

Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye.