(a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.
(b) We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
(a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.
(b) We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
(a) The person is suffering from Hypermetropia i.e. Far-sightedness
Hypermetropia is caused due to:
(i)The focal length of the eye lens is too long
(ii)Decrease in the length of the eyeball
This defect can be corrected using convex lens of appropriate focal length
(b)Eye donation :
Our eye can live even after our death, so by donating our eyes, we can give vision to any blind person and make him see. By giving such advertisement in newspaper we can aware more people for this noble cause and raise the number of donations for blind people
(a) The person is suffering from Hypermetropia i.e. Far-sightedness
Hypermetropia is caused due to:
(i)The focal length of the eye lens is too long
(ii)Decrease in the length of the eyeball
This defect can be corrected using convex lens of appropriate focal length
(b)Eye donation :
Our eye can live even after our death, so by donating our eyes, we can give vision to any blind person and make him see. By giving such advertisement in newspaper we can aware more people for this noble cause and raise the number of donations for blind people
