Question

Hey there brainliacs♥️♥️♥️✔️

Question for the known ones only

An eye specialist suggested a +2D lens to the person with defect in the vision .
Which kind of defect in the vision does he have ?

Draw diagrams to show the defect of vision and its correction with suitable lens.

Answer 1

$\boxed{ANSWER}$ :-

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

•As the value of power of lens is positive .

$\boxed{Hypermetropia}$

—> 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 :)

Answer 2

$\huge{ \frak {\red{ \underline {\underline{Your \: Answer :-}}}}}$

$\rightarrow \mathtt{ \: If \: the \: person \: uses \: the \: lens \: of }$

$\tt{power +2 \: Dioptre (positive).}$

$\rightarrow \tt{Then \: the \: person \: is \: using \: the \: Convex \: lens.}$

$\rightarrow \tt{The \: convex \: lens \: is \: used \: to \: correct }$

$\tt{the \: Hypermetropia \: (Far -sightedness).}$

★ Hypermetropia is the defect of vision in which a person sees faraway objects clearly but cannot see the nearby objects.

★ $\frak{The \: image \: is \: formed \: behind \: }$$\frak{retina \: in \: \bold{Hypermetropia.}}$

$\boxed{\large{ \green{ \star\: Causes : }}}$

1 ] The distance between the eye lens and retina decreases on account of either shortening of eyeball or flattening of lens.

2 ] Weak action of ciliary muscles causes low converging power of lens.