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The Human Eye and the Colourful World EXERCISES Solutions
- Q1: The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to
- Q2: The human eye forms the image of an object at its
- Q3: The least distance of distinct vision for a young adult with normal vision is about
- Q4: The change in focal length of an eye lens is caused by the action of the
- Q5(i): A person needs a lens of power $-5.5$ dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power $+1.5$ dioptre. What is the focal length of the lens required for correcting (i) distant vision?
- Q5(ii): A person needs a lens of power $-5.5$ dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power $+1.5$ dioptre. What is the focal length of the lens required for correcting (ii) near vision?
- Q6: The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
- Q7: Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
- Q8: Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
- Q9: What happens to the image distance in the eye when we increase the distance of an object from the eye?
- Q10: Why do stars twinkle?
- Q11: Explain why the planets do not twinkle.
- Q12: Why does the sky appear dark instead of blue to an astronaut?
Chapters in CBSE - Class 10 Science
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