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Students who want to score optimum marks in CBSE Class 10 Science paper, are advised to follow the NCERT book thoroughly and solve the NCERT questions. Here, we are providing the accurate solutions to all these questions which you may refer to check the correctness of your own solutions.
Some of the questions and their solutions from NCERT Solutions for Class 10: Human Eye and Colourful World, are as follows:
Q.┬аWhat is the far point and near point of the human eye with normal vision?
Sol.┬аThe far point of the normal human eye is infinity. The far point of the eye is the maximum distance to which the eye can see the objects clearly.
The near point of the eye is the minimum distance of the object from the eye, which can be seen distinctly without strain. For a normal human eye, this distance is 25 cm.
Q.┬аA 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?
Sol.┬аHe is unable to see distant objects clearly. He is suffering from myopia. This defect can be corrected by using a concave lens.
Q.┬аThe human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) Presbyopia
(b) Accommodation
(c) Near-sightedness
(d) Far-sightedness
Sol.┬а(b) Accommodation
Q.┬аWhat happens to the image distance in the eye when we increase the distance of an object from the eye?
Sol.┬аWhen we increase the distance of an object from the eye, the image distance in the eye does not change. The increase in the object distance is compensated by the change in the focal length of the eye lens. The focal length of the eyes changes in such a way that the image is always formed at the retina of the eye.
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