English

Though a Woman Can See the Distant Object Clearly, She Cannot See the Nearby Objects Clearly. She is Suffering from the Defect of Vision Called: (A) Long-sight (B) Short-sight (C) Hind-sight (D) Mid-sight - Science

Advertisements
Advertisements

Question

Though a woman can see the distant object clearly, she cannot see the nearby objects clearly. She is suffering from the defect of vision called:
(a) long-sight
(b) short-sight
(c) hind-sight
(d) mid-sight

Advertisements

Solution

long sight

As the woman can see distant objects clearly, but not nearby objects, she is suffering from the defect of vision called long sight.

shaalaa.com
  Is there an error in this question or solution?
Chapter 6: The Human Eyes And The Colorful World - Exercise 2 [Page 280]

APPEARS IN

Lakhmir Singh Physics (Science) [English] Class 10
Chapter 6 The Human Eyes And The Colorful World
Exercise 2 | Q 38 | Page 280

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

In a Std. X class out of 40 students 10 students use spectacles, 2 students have positive power and 8 students have negative power of lenses in their spectacles.

Answer the following questions:

(1) What does the negative power indicate?

(2) What does the positive power indicate?

(3) Generally which type of spectacles do most of the students use?

(4) What defect of eyesight do most of the students suffer from?

(5) Give two possible reasons for the above defect.


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


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?


Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect.


 An eye has a near point distance of 0.75 m. What sort of lens in spectacles would be needed to reduce the near point distance to 0.25 m? Also calculate the power of lens required. Is this eye long-sighted or short-sighted? 


A short-sighted person has a near point of 15 cm and a far point of 40 cm.
(a) Can he see clearly an object at a distance of:
(i) 5 cm?
(ii) 25 cm?
(iii) 50 cm?
(b) To see clearly an object at infinity, what kind of spectacle lenses does he need?


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


Name an old age eye defect. What happens in it?


By closing the eyes and gently pressing them by your palms, you may see some specks of brilliant light. How do you get this sensation while there is no light entering your eyes?


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.

 Name the common defects of the eye.


Give Reason:

Why do we see clearly in the central region of the retina?


Give Reason:

Older people require glasses to read and write.


Differentiate between:

Myopia and Hypermetropia.


Explain the Term: Astigmatism


The diagram given below represents the cross-section of the human eye:

(i) Name the parts labeled 1—12.
(ii) What is the function of the part marked ‘10’?
(iii) What would happen if part ‘5’ is damaged or cut?


Given below is a diagrammatic representation of a defect of the human eye:

(i) Identify the defect.
(ii) Mention two reasons for the above defect.
(iii) State how the defect can be rectified.
(iv) Name the part of the eye responsible for maintaining the shape of the eyeball.


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?


Given alongside is a diagram depicting a defect of the human eye. Study the same and answer the questions that follow:

  1. Name the defect shown in the diagram.
  2. Give two possible reasons for this defect.
  3. Name the parts labelled 1 to 4.
  4. Name the type of lens used to correct this eye defect.
  5. Draw a labelled diagram to show how the above mentioned defect is rectified using the lens named above.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×