(a) What would be the image distance in a myopic human eye, if an object iskept at(i) 25 cm from the eye;(ii) infinity?(b) Draw diagrams showing the defect Hypermetropia and its correction.(c) A child wears corrective lenses of focal length –50 cm. What defect is hesuffering from? What is the power of his lenses?
Answers
(a) (i) Image is formed at retina
(ii)The image is formed in front of the retina
(c) The child is suffering from myopia and the power of the lens is -2 Diopter
Explanation:
(a)
- Myopia is called as Nearsightedness, which results in poor or blurry vision for the objects in longer distance.
- Myopia occurs when one's eye shape causes bend in light rays and thus results in image formed in front of the retina.
- For the normal person with better eyesight , the image is formed on the retina.
(i) If an object is kept at distance of 25 cm from the eye, for a person suffered from myopic, the image of the of the object is formed at the retina
(ii) If an object is kept at distance of infinity, for a person suffered from myopic, the image of the object is formed in front of the retina
(b) The diagram showing the effect of Hypermetropia and its correction is attached for reference.
- Hypermetropia is a type of eye defect occur when the eyeball is slightly very short which results in poor vision for closer objects . and it can be corrected by using "convex lens"
(c) The negative focal length indicates the lens used by the child is concave and the child is suffered from Myopia.
Focal length of the lens, (f) = - 50 cm
(f) = -0.50 m
The formula to calculate the power of the lens is
To Learn More ...
1) A person cannot see distinctly objects kept beyond 2m.This defect can be corrected by using a lens of what power?
https://brainly.in/question/1047254
2)The near point of a person suffering from hypermetropia is 75 cm calculate the focal length and power of lens required to enable him to read news paper which is kept at 25 cm from the eye?
https://brainly.in/question/4775482
