MEDIUM
10th CBSE
IMPORTANT
Earn 100
A person suffering from eye-defect myopia (short-sightedness) can see clearly only up to a distance of . What is the nature and power of the lens required to rectify this defect?
Important Questions on The Human Eye and The Colourful World
MEDIUM
10th CBSE
IMPORTANT
The near point of a person suffering from hypermetropia is at from his eye. What is the nature and power of the lens needed to correct this defect? (Assume that the near point of the normal eye is ).
MEDIUM
10th CBSE
IMPORTANT
A person needs a lens of power, for correcting his distant vision. For correcting his near vision, he needs a lens of power, . What is the focal length of the lens required for correcting distant vision.
MEDIUM
10th CBSE
IMPORTANT
A person needs a lens of power, for correcting his distant vision. For correcting his near vision, he needs a lens of power, . What is the focal length of the lens required for correcting near vision.
EASY
10th CBSE
IMPORTANT
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
EASY
10th CBSE
IMPORTANT
When is a person said to have developed a cataract in his eye? How is the vision of a person having cataract restored?
MEDIUM
10th CBSE
IMPORTANT
What is short-sightedness? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show the eye-defect short-sightedness. Also, show the correction of short-sightedness by using a lens.
MEDIUM
10th CBSE
IMPORTANT
A person having short-sight cannot see objects clearly beyond a distance of . What would be the nature and power of the corrective lens to restore proper vision?
MEDIUM
10th CBSE
IMPORTANT
What is long-sightedness? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show the eye-defect long-sightedness and correction of long-sightedness by using a lens.
