Question

A person A can clearly see objects between $25\text{cm}$ and $200\text{cm}.$ Which of the following may represent the range of clear vision for a person $\text{B}$ having muscles stronger than $\text{A}$, but all other parameters of eye identical to that of $\text{A}$?

• A. $25\text{cm}\text{to}200\text{cm}$
• B. $18\text{cm}\text{to}200\text{cm}$
• C. $25\text{cm}\text{to}300\text{cm}$
• D. $18\text{cm}\text{to}300\text{cm}$

Answer 1

The correct option is B $18\text{cm}\text{to}200\text{cm}$

Stronger muscles of $\text{B}$ will allow the person to contract the eye lens more than compared to the person $\text{A}$. This will increase the radius of curvature of the eye lens and hence this will increase the focus of the lens. So the person $B$ would be able to see closer objects more clearly.

But person $\text{B}$ will see same as person $\text{A}$, when looking the far object because stronger muscle does not help in relaxing the eye lens to see for objects.

So, person $\text{B}$ can see the objects between $18\text{cm}\text{to}200\text{cm}$.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(B\right)$ is the correct answer.

Why this question ? Concept : To see nearby object, strong muscle and more focal length of the eye lens is required. To see far objects clearly, relaxed eye and less focal length of the lens is required.