HUMAN EYE AND COLOURFUL WORLD
IMPORTANT QUESTIONS
1 Mark Questions
Q.l. What is the defect from which the eye shown in the figure suffers?
Q.2. The image of an object near the eye is being formed at I, as shown. Name the
defect from which the eye suffers.
Q.3. Complete the given diagram for a corrected myopic eye. Where are the
far point and the near point for such an eye?
Q.4. Complete the given fig. for a hypermetropic eye. Mark the near point and the
far point of such an eye.
Q.5. In fig below, three cases of a ray of light passing through a prism. Which of
these rays is suffering minimum deviation ?
Q.6. Figure shows a ray of white light suffering dispersion. Correct the diagram if
you feel it needs correction and redraw it.
Q.7. What is meant by power of accommodation of the eye ?
Q.8. What is the far point and near point of the human eye with normal
vision?
Q.9. 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?
Q.10. Why is a normal eye not able to see clearly the objects placed closer than 25
cm?
Q.11. What happens to the image distance in the eye when we increase the
distance of an object from the eye?
Q.12. Why does the sky appear dark instead of blue to an astronaut?
Q.13. Name the essential parts of human eye.
Q.14. What is cornea?
Q.15. Which liquid fills the space behind the cornea?
Q.16. What is iris?
Q.17. Which part of the eye controls the amount of light entering the eye?
Q.18. What is eye lens made of ? Ans. It is made of a jelly like material.
Q.19. How is the eye lens held in its position?
Q.20. How is the sense of vision carried from the eye to the brain?
Q.21. Which liquid fills the space between eye lens and retina?
Q.22. What is a blind spot?
Q.23. What is meant by far point?
Q.24. What is the far point of a normal human eye?
Q.25. What is meant by near point ?
Q.26. What is meant by least distance of distinct vision?
Q.27. How is near sightedness corrected?
Q.28. How is long sightedness corrected?
Q.29. What is astigmatism?
Q.30. How is astigmatism corrected?
Q.31. A person has to use a concave lens in his spectacles. Which defect of vision is he suffering from?
Q.32. Why can you not see an object clearly if it is placed very close to your eye?
Q.33. When you enter from a bright sun shine into a dark room, you are not able to see clearly for sometime, why?
Q.34. Sometimes you see a person reading the newspaper by placing it very close to his eyes. Which defect is he suffering from? How can the defect be removed?
Q.35. Sometime you see a person reading the newspaper by placing it far away from his eyes, which defect is he suffering from? How can the defect be removed?
Q.36. What is presbyopia?
Q.37. What is twinkling of stars due to?
Q.38. Define dispersion of white light.
Q.39. Give one example in nature where we can see dispersion of white light.
Q.40. What kind of lens is used in the spectacles of a person suffering from myopia (near sightedness) ?
Q.41. In myopia, what happens to the power of the eye lens?
Q.42. Why does sky look blue on a clear day?
IMPORTANT QUESTIONS
1 Mark Questions
Q.l. What is the defect from which the eye shown in the figure suffers?
Q.2. The image of an object near the eye is being formed at I, as shown. Name the
defect from which the eye suffers.
Q.3. Complete the given diagram for a corrected myopic eye. Where are the
far point and the near point for such an eye?
Q.4. Complete the given fig. for a hypermetropic eye. Mark the near point and the
far point of such an eye.
Q.5. In fig below, three cases of a ray of light passing through a prism. Which of
these rays is suffering minimum deviation ?
Q.6. Figure shows a ray of white light suffering dispersion. Correct the diagram if
you feel it needs correction and redraw it.
Q.7. What is meant by power of accommodation of the eye ?
Q.8. What is the far point and near point of the human eye with normal
vision?
Q.9. 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?
Q.10. Why is a normal eye not able to see clearly the objects placed closer than 25
cm?
Q.11. What happens to the image distance in the eye when we increase the
distance of an object from the eye?
Q.12. Why does the sky appear dark instead of blue to an astronaut?
Q.13. Name the essential parts of human eye.
Q.14. What is cornea?
Q.15. Which liquid fills the space behind the cornea?
Q.16. What is iris?
Q.17. Which part of the eye controls the amount of light entering the eye?
Q.18. What is eye lens made of ? Ans. It is made of a jelly like material.
Q.19. How is the eye lens held in its position?
Q.20. How is the sense of vision carried from the eye to the brain?
Q.21. Which liquid fills the space between eye lens and retina?
Q.22. What is a blind spot?
Q.23. What is meant by far point?
Q.24. What is the far point of a normal human eye?
Q.25. What is meant by near point ?
Q.26. What is meant by least distance of distinct vision?
Q.27. How is near sightedness corrected?
Q.28. How is long sightedness corrected?
Q.29. What is astigmatism?
Q.30. How is astigmatism corrected?
Q.31. A person has to use a concave lens in his spectacles. Which defect of vision is he suffering from?
Q.32. Why can you not see an object clearly if it is placed very close to your eye?
Q.33. When you enter from a bright sun shine into a dark room, you are not able to see clearly for sometime, why?
Q.34. Sometimes you see a person reading the newspaper by placing it very close to his eyes. Which defect is he suffering from? How can the defect be removed?
Q.35. Sometime you see a person reading the newspaper by placing it far away from his eyes, which defect is he suffering from? How can the defect be removed?
Q.36. What is presbyopia?
Q.37. What is twinkling of stars due to?
Q.38. Define dispersion of white light.
Q.39. Give one example in nature where we can see dispersion of white light.
Q.40. What kind of lens is used in the spectacles of a person suffering from myopia (near sightedness) ?
Q.41. In myopia, what happens to the power of the eye lens?
Q.42. Why does sky look blue on a clear day?
