What are the advantages of human eye?

Write the names of the different refractive medium of eyeball in proper sequence.

A person can see distant objects distinctly but is unable to see nearby objects in a perfect way. Predict the probable cause and suggest the corrective measure for such problem.

When the lights of a brightly lit room are suddenly put out, the people of the room are blinded for a moment. Why?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Assertion: Normal eye cannot see objects clearly which are situated less than $25 \mathrm{cm}$ away from the eye.

Reason: The distance of the retina from the eye lens is less than $25 \mathrm{cm}.$

Name the part of eye

(a) that controls the amount of light entering into the eye.

(b) that has real, inverted image on the object formed on it.

Write W for the incorrect statements and R for the correct ones:

The length of the image of an object formed by the eye is proportional to the visual angle subtended at the eye by the object.

Assertion: Street lamp-posts appear to be shorter the farther they are, although, they are all the same height.

Reason: The angle subtended at the eye by far-away posts are shorter.