English
Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10

What are the causes of ‘Myopia’? - Science

Advertisements
Advertisements

Question

What are the causes of ‘Myopia’?

Short Note

Solution

Myopia, also known as short-sightedness, occurs due to the lengthening of the eyeball. With this defect, nearby objects can be seen clearly but distant objects cannot be seen clearly.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Optics - Evaluation [Page 30]

APPEARS IN

Samacheer Kalvi Science [English] Class 10 SSLC TN Board
Chapter 2 Optics
Evaluation | Q VI. 8. | Page 30

RELATED QUESTIONS

Given below is a diagram showing a defect of human eye. Study it and answer the following questions.

(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.


A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him. Name the defect of vision the boy is suffering from. Explain the method of correcting this defect.

Draw ray diagram for the:-

(i) defect of vision and also

(ii) for its correction.


A man can read the number of a distant but clearly but he finds difficulty in reading a book. 

 From which defect of the eye is he suffering?


To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses?


Which part of the eye is grafted in a needy patient from a donated eye?


Differentiate between members of the following pair with reference to what is asked in bracket.

Myopia and hyperopia (cause of the defect)


Differentiate between members of the following pair with reference to what is asked in the bracket.

Rods and cones (sensitivity).


Give Reason:

Deficiency of vitamin A causes night blindness.


Assertion: Myopia is the defect of vision in which a person cannot see distant objects clearly.

Reason: This due to eye-ball being too short.


A person needs a lens of power –4.5 D for correction of her vision.

  1. What kind of defect in vision is she suffering from?
  2. What is the focal length of the corrective lens?
  3. What is the nature of the corrective lens?

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×