A child while playing with his father’s spectacles burnt a hole in a piece of them tissue paper by focusing the image of the Sun on at. a) Name the defect of vision his father is suffering form. b) List two causes of the defect. c) Draw a ray diagram to show how this defect may be corrected using a suitable lens.
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father is suffering from far sightedness...and lens is convex lens
this defect occurs coz eyelens does not become thick according to requirements
this defect occurs coz eyelens does not become thick according to requirements
sidcuberz:
1. This shows that the lens in his father's spectacles is convex lens and a convex lens is used to correct the hypermetropia. Thus his father is suffering from hypermetropia.
2. Causes of Hypermetropia : a. Contraction in the size of the eyeball, i.e., distance of retina from the eye lens has decreased.
b. Increase in the focal length of the eye lens, when the eye is fully relaxed.
b. Increase in the focal length of the eye lens, when the eye is fully relaxed.
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Lens used: Convex lens (Converging lens)
a) Hypermetropia
b) Causes
- The focal length of the eye lens is too long or,
- The eye ball has become too small
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