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

Name the defect shown in the diagram.
Advertisements
उत्तर
Myopia, Short-sightedness.
APPEARS IN
संबंधित प्रश्न
An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity? Also calculate the power of lens required. Is this eye long-sighted or short-sighted?

The picture given here shows a person wearing ‘half-moon’ spectacles. What sort of eye-defect do you think he has? Why are these particular spectacles useful to him?
State the main functions of the following:
Tears
Given alongside is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow:

- Identify the defect.
- Name the parts labelled 1, 2 and 3.
- Give two possible reasons for this eye defect.
- Draw a labelled diagram to show how the above mentioned defect is rectified.
In what two whys is a yellow spot different from the blind spot?
Give Reason:
Deficiency of vitamin A causes night blindness.
Which of the following statement is correct?
State reasons for Myopia. With the help of ray diagrams, show the:
- image formation by a myopic eye, and
- correction of myopia using an appropriate lens.
A person is unable to see clearly a poster fixed on a distant wall. He however sees it clearly when standing at a distance of about 2 m from the wall.
- Draw ray diagram to show the formation of image by his eye lens when he is far away from the wall.
- List two possible reasons of this defect of vision.
- Draw ray diagram to show the correction of this defect using appropriate lens.
Observe the following diagram and answer questions following it:

- Identify the defect of vision shown.
- List its two causes.
- Name the type of lens used for the correction of this defect.
