EASY
10th CBSE
IMPORTANT
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is the defect of vision in which the eye lens becomes cloudy leading to blurred vision.

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Important Questions on Human Eye and the Colorful World

EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 1
A human eye has a natural lens that is convex in nature.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 2
The pupil of the eye dilates when the light is dim.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 3
Iris is the part in the eye responsible for its power of accommodation.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 4
A short-sighted person can see near objects clearly.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 5
Concave lens is used to correct a hypermetropia.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 6
Presbyopia is a special case of myopia that develops with old age.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 7
Cataract is the defect of vision in which the eye loses its power of accommodation due to old age.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE PHYSICS FOR CLASS X>Chapter 5 - Human Eye and the Colorful World>EXERCISE>Q 1
Hypermetropia and myopia are the most common defects of vision affecting humans. Both these defects can be corrected and perfect vision can be restored with the use of suitable lenses of appropriate focal lengths. Hypermetropia can be corrected by using convex lenses while myopia can be corrected by using concave lenses. The power of prescribed lens for both these defects depends on the focal length of the respective corrective lens. The power, P of the lens is given by
P=1f (in metres) dioptres
Now, consider a situation in which the near point of a defective eye is at a distance of 1.0 m. Assuming the near point of a normal eye to be 25 cm, answer the following question:
What type of lens should be used to correct the vision?