A person can see objects clearly only when th | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The person suffers from myopia (nearsightedness) because they cannot see objects beyond $400\, cm$.To correct this, we need to place a lens such t

Vedclass · Accepted Answer

concave, $-0.25$ diopter

Vedclass · Answer

(A) The person suffers from myopia (nearsightedness) because they cannot see objects beyond $400\, cm$.To correct this, we need to place a lens such that an object at infinity $(\infty)$ forms a virtual image at the person's far point $(400\, cm)$.Given: Object distance $u = -\infty$, Image distance $v = -400\, cm = -4\, m$.Using the lens formula: $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$.Substituting the values: $\frac{1}{f} = \frac{1}{-4} - \frac{1}{-\infty} = -0.25\, m^{-1}$.Since the focal length $f$ is negative, the lens must be concave.The power of the lens $P = \frac{1}{f} = -0.25\, D$.

$A$ person can see objects clearly only when they lie between $50\, cm$ and $400\, cm$ from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens the person has to use will be

Similar Questions

When the human eye is focused on an object,the ciliary muscles are least strained when the object is at:

The least distance of distinct vision for a long-sighted person is $x \ m$. He wants to read a newspaper placed at a distance $(x/2) \ m$. The power of the spectacle lens used by him is $x \ D$. What is the value of $x$?

$A$ short-sighted person can see distinctly only those objects which lie between $10\, cm$ and $100\, cm$ from him. The power of the spectacle lens required to see a distant object is

$A$ person uses spectacles of power $+2D$. He is suffering from

$A$ man who cannot see clearly beyond $5 \, m$ wants to see stars clearly. He should use a lens of focal length ....... $m$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module