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Defects of Vision and Their Correction

Long-sightedn...

Question

Long-sightedness is caused by the eyeball being too short. It can be corrected by the use of a :

A

convergent lens

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B

plane mirror

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C

divergent lens

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D

concave mirror

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Solution

The correct option is B convergent lens
In long sightedness, size of the eyes ball decrease due to which image of the object formed behind the ratina. This defect can be corrected by using additional converging lens of sufficient power. That lens will help the eyes to formed image on the ratina. Hence converging lens required.

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Similar questions

Q. Complete the following sentences:
(a) A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
(b) A long-sighted person cannot see ........... objects clearly. Long-sightedness can be corrected by using .............. lenses.

Q. How is short sightedness (Myopia) caused? How it can be corrected? Explain with diagram.

Q. Fill in the following blanks with suitable words:
A person is short-sighted if his eyeball is too............Spectacles with a .............lens are needed. A person is long-sighted if his eyeball is too............Spectacles with a ................lens are needed. These focus light rays exactly on to the..........

Q. Fill in the following blanks with suitable words :
A person is short-sighted if his eyeball is too ___ Spectacles with a ___ lens are needed. A person is long-sighted if his eyeball is too ___ Spectacles with a ___ lens are needed. These focus light rays exactly on to the ___

Q. What is meant by long-sightedness? How can this defect be corrected?

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