a Name the part of human eye that helps to focus near and distant objects in quick succession Explain its functioning b A person is advised to wear spectacles with concave lenses What type of defect of vision is
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( a ) Name the part of human eye that helps to focus near and distant objects in quick succession. Explain its functioning. ( b ) A person is advised to wear spectacles with concave lenses. What type of defect of vision is

CBSE class10 Science 2016


By:Fututron

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(a)Ciliary muscles.


An eye can focus the images of distant objects and nearby objects on its
retina by changing the focal length of its lens. The focal length of the eye
lens is changed by the action of ciliary muscles. The ciliary muscles can
change the thickness of the soft and flexible eye lens, and hence, the focal
length, which in turn, changes the converging power of the eye lens.


(b)The person is suffering from myopia, so he is advised to wear spectacles with
concave lenses. In myopia, a person cannot see distant objects clearly. This
defect is corrected using spectacles with concave lenses.


(c) The iris is a flat, coloured, ring-shaped membrane behind the cornea of the
eye. It controls the amount of light entering the eye by changing the size of
the pupil.


13priya

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