For a person suffering from myopia,the image of the object is formed in front of the retina.

Write the value of the near point of distinct vision for a normal eye.

Which of the following is true for the eye defect known as hypermetropia (farsightedness)?

What is the iris?

$A$ student finds the writing on the blackboard blurred and unclear while sitting on the last desk in a classroom. He,however,sees it clearly while sitting on the front desk at about $2\, m$ from the blackboard.
$(a)$ Draw ray diagrams to illustrate the formation of image of the blackboard writing by his eye lens when he is seated at the $(i)$ last desk,$(ii)$ front desk.
$(b)$ Name the defect of the eye from which the student is suffering.
$(c)$ Name the kind of lens that would help him to see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.

Name the condition resulting due to the eye lens becoming cloudy.