- Home/
- CDS & Defence/
- Article
A Person With a Myopic Eye Cannot See Objects Beyond 1.2 M Distinctly. What Should Be the Type of Corrective Lens Used to Restore Proper Vision?
By BYJU'S Exam Prep
Updated on: September 25th, 2023
The type of corrective lens used to restore proper vision is concave or diverging lens.
Step 1. a formula for calculating lens power
The faraway point appears to be infinity to a normal eye. The lens should be set up so that a virtual image of an object at infinity appears at 1.2 metres.
Here is a formula to determine a lens’s power:
P = 1/f
In this case, the focal length is f and the lens’s power is P.
The relation is
1/f = 1/v – 1/u
Where v = image distance and
u = object distance.
Step 2. Determine the corrective lens’s power to get your eyesight back to normal.
Given that, a person cannot directly perceive objects farther than 1.2 metres.
Consequently, to see the distances beyond 1.2 metres from the indicated
v = -1.2 m
u = -∞
f = ?
Substituting the values in the relation, we get,
1/f = 1/-1.2 – 1/(-∞)
1/f = -1/1.2
On simplifying we get
f = -1.2 m
Substitute focal length in the power of lens formula, we get,
P = 1/-1.2
P = -⅚
P = -0.83 D
The corrective lens will be divergent or concave if the wearer has myopia.
Therefore, the power is -0.83 D has to be used to restore proper vision.
Table of content
Summary:-
A Person With a Myopic Eye Cannot See Objects Beyond 1.2 M Distinctly. What Should Be the Type of Corrective Lens Used to Restore Proper Vision?
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. The type of corrective lens used to restore proper vision is concave or diverging lens.
Related Questions:-
- Mention the Hazards of Working in the Glass Bangles Industry
- Rs 2250 is Divided Among Three Friends Amar Bijoy and Chandra in Such a Way That 16th of Amars Share 14th of Bijoys Share
- The Damping Method Used in Horizontally Mounted Moving Iron Instrument is
- The Least Count of a Stop Watch is 02 S the Time of 20 Oscillations of a Pendulum is Measured to Be 25s the Percentage Error
- The Moon is Observed From Two Diametrically Extremes a and B on Earth the Angle of Parallax is Found to Be 1 Degree 54
- The Numerical Ratio of Displacement to Distance for a Moving Object is