Near point of an eye suffering from long-sightedness is:

less than 25cm

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greater than 25cm

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equal to 25cm

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Infinity

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Solution

The correct option is B greater than 25cm
In long sightedness, for close objects image is formed behind the retina. This is because the near point of the eye shifts to a distance greater than $25 c m$ for the eye due to shortening of eyeball.

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Similar questions

(a) What is long-sightedness ? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show :
(i) the eye-defect long-sightedness.
(ii) correction of long-sightedness by using a lens.
(b) An eye has a near point distance of 0.75 m. What short of lens in spectacles would be needed to reduce the near point distance to 0.25 m ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ?
(c) An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ?

Q. What is long-sightedness? The near point of a long-sighted person is at

100 c m

from his eyes. What would be the power of the lens to be used by him in order to read a book placed at

25 c m

from his eyes?

Q. (a) Explain the following-
(i) Atmospheric refraction and advance sunrise.
(ii) Tyndall effect.
(iii) Draw the ray diagram of an eye suffering from short sightedness.

Q. A long-sighted person cannot see objects clearly at a distance less than

40 c m

from his eye. The power of the lens needed to read an object at

25 c m

Q. The near point of a long sighted person is 40 cm from the eye. To read a book held at a distance of 25 cm, he will need spectacles containing

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Near point of an eye suffering from long-sightedness is:

The correct option is B greater than 25cmIn long sightedness, for close objects image is formed behind the retina. This is because the near point of the eye shifts to a distance greater than 25 cm for the eye due to shortening of eyeball.

The correct option is B greater than 25cm
In long sightedness, for close objects image is formed behind the retina. This is because the near point of the eye shifts to a distance greater than $25 c m$ for the eye due to shortening of eyeball.