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प्रश्न
The diagram alongside represents a section of a mammalian eye.
(i) Label the parts 1 to 5 of the diagram.
(ii) State the function of the parts labelled 4 and 5.
(iii) With the help of a diagram show the short sightedness.
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उत्तर
(i) 1- Retina
2 - Yellow spot
3 - Blind spot
4 - Optic nerve
5 - Lens
(ii) Optic nerves - It transmits the impulses to the brain.
Lens - It focuses the image on the retina.
(iii) Short sightedness:
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संबंधित प्रश्न
Which defect of vision can be rectified:
by using a convex lens?
Name any two defects of vision which can be corrected by using spectacles.
Your friend can read a book perfectly well but cannot read the writing on blackboard unless she sits on the front row in class.
What type of lenses-converging or diverging-would an optician prescribe for her?
A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard.
Name the type of defect he is suffering from.
Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defect.
What is short-sightedness? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show:
(i) the eye-defect short-sightedness.
(ii) correction of short-sightedness by using a lens.
List two causes of presbyopia. Draw labelled diagram of a lens used for the correction of this defect of vision.
Draw a neat labeled diagram to show how hypermetropia can be rectified.
Due to elongation of _______ and increase in curvature of the eye lens, a person cannot see distant objects clearly.
Correlate the given sequence:
Hypermetropia : Convex lens : ______ : Concave lens
