10th Standard CBSE Syllabus & Materials

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CBSE 10th Standard Science Subject Human Eye and the Colourful World HOT Questions 2 Mark Questions With Solution 2021

Published on: 29/05/2021

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Questions:

Generic 2

4 x 2 = 8

To correct myopia why we use concave lens and to correct hypermetropia, why do we use convex lens? Why can't we do vice-versa?

Mention few important features of visual system of a person?

A person has normal vision, but he cannot distinguish between red-green colour. Why?

Does myopia or hypermetropia imply necessary that the eye has partially lost its ability of accommodation? If not, what cause these defect of vision?

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Answers Key:

Generic 2

4 x 2 = 8

Myopia is a defect in which the image 1S formed in front of retina. We need to use diverging lens so that it can further diverge the light rays before it enters our eye and make it possible to meet on the retina.
In case of hypermetropia, the image is formed beyond retina, we need to use convex lens so as to converge the rays and make it possible for the rays to meets on the retina

(i) The structures of the eye such as cornea, pupil, ciliary muscles, eye lens, aqueous humour and vitreous humour etc.,
(ii) The retina of the eye which converts light signals to electrical impulses and
(iii) Optic nerve that transmit electrical impulses to brain.

A person who is blind to red-green colour may be deficient in cone shaped cell having red and green pigment in the retina of his eyes. It is a genetic disorder and not a refractive defect of vision. That is why such a person may have normal vision.

No, a person may have normal of accommodation and yet he may be myopic or hypermetropic. Infact. Myopia may arise when length of eye ball elongated and hypermetropia may arise when length of eye ball gets shortened.