Question

An eye specialist suggested a + 2D lens to the person with defect in vision. Which
sind of defect in vision does he have ? Draw the diagrams to show the defect of
sion and its correction with a suitable lens.
June 2017​

Answer 1

Answer:

He has an eye defect named \bold{Hypermetropia}Hypermetropia .

•As the value of power of lens is positive .

\boxed{Hypermetropia}

Hypermetropia

—> It is called as Far sightedness

—> A person with this defect can’t see object at near distances clearly.

—> The focal length of eye lens formed is greater than 2.27cm

—> When rays comes from near objects ,after refraction at eye lens ,the image is formed beyond retina.

—> For people of this defect,the eye lens can form the image on retina when object is placed beyond far point.

—>So to correct this defect we use the eye lens which forms an image of an object beyond near point.The object is between near point and least distance of distinct vision.

—> We use biconcave lens to correct defect of hypermetropia

Refer attachment