English
Maharashtra State BoardSSC (English Medium) 10th Standard

Rewrite the Following Table So as to Match Second and Third Column with First Column. - Science and Technology 1

Advertisements
Advertisements

Question

Rewrite the following table so as to match second and third column with first column.

 

Column I
Column II
Column III
(i) Myopia
Old age problem
Bifocal lens
(ii) Presbyopia
Nearsightedness
Concave lens.
Match the Columns
Advertisements

Solution

Column I
Column II
Column III
(i) Myopia
Nearsightedness
Concave lens.
(ii) Presbyopia
Old age problem
Bifocal lens
shaalaa.com
  Is there an error in this question or solution?
2013-2014 (October)

APPEARS IN

RELATED QUESTIONS

Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?


Millions of people in the developing countries of the world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate in this mission, how would you contribute in this noble cause?

(i) State the objective of organising such campaigns.

(ii) List two arguments which you would give to motivate the people to donate their eyes after death.

(iii) List two values which are developed in the persons who actively participate and contribute in such programmes.


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.


Name the defect of vision in a person: 

 whose near point is more than 25 on away.  


 Which defect of vision can be rectified: 

by using a concave lens?


What is the scientific name of 

short-sightedness


What is the other name of old age hypermetropia?


Name the body part with which the terms myopia and hypermetropia are connected.


What is the far point of a person suffering from myopia (or short-sightedness)?


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

What type of spectacle lens should he use to correct the  defect?


A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard. 

 How can this defect by corrected?


Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help?


 A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision?


A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision:  

if the person is a young man 


Have a look at the posture of this girl who is reading a book and answer the questions which follow:

Name the problem she is facing.


A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction.


What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can be corrected by using an appropriate lens.


A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?


When do we consider a student sitting in the class to be myopic? List two causes of this defect. Explain using a ray diagram how this defect of eye can be corrected.


Name the following:
The photosensitive pigment present in the rod cells of the retina.


Distinguish between the following pair of words:
Myopia and hypermetropia


Choose the correct answer : 
Presbyopia is a disease of _____________


Given below is a diagram depicting a defect of the human eye? Study the same and answer the question that follow :

Name the type of lens used to correct this eye defect.


Anuja cannot see the blackboard writing but she can see nearby things.
(a) What is the eye defect she is suffering from?
(b) State the possible reason for her defect.
(c) How is it corrected


A person is unable to see objects distinctly placed within 50 cm from his eyes.

(a) Name the defect of vision the person is suffering from and list its two possible causes.

(b) Draw a ray diagram to show the defect in the above case.

(c) Mention the type of lens used by him for the correction of the defect and calculate its power. Assume that the near point for the normal eye is 25 cm.

(d) Draw a labeled diagram for the correction of the defect in the above case.


 Name the common defects of the eye.


Give Reason:

When you enter into a dark room from bright because of sunlight, you can not see things for a few seconds.


Differentiate between:

Short-sightedness and Long-sightedness.


Explain the Term: Presbyopia


Due to elongation of _______ and increase in curvature of the eye lens, a person cannot see distant objects clearly.


Write scientific reason.

Nearsightedness, this defect can be corrected by using spectacles with concave lens.


Myopia may arise due to ____________.


A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.


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?

When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?


State reasons for Myopia. With the help of ray diagrams, show the:

  1. image formation by a myopic eye, and
  2. correction of myopia using an appropriate lens.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×