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Question
Which part of the eye is grafted in a needy patient from a donated eye?
Options
Conjunctiva
Cornea
Choroid
Ciliary muscles
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Solution
Cornea
RELATED QUESTIONS
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.
A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision:
if the person is a young man
Describe the mechanism of focusing the image of a distant object in your eye when you raise your head after reading a book.
State the main functions of the following:
Tears
A person is unable to see objects distinctly placed within 50 cm from his eyes.
(a) Name the defect of vision the person is suffering from and list its two possible causes.
(b) Draw a ray diagram to show the defect in the above case.
(c) Mention the type of lens used by him for the correction of the defect and calculate its power. Assume that the near point for the normal eye is 25 cm.
(d) Draw a labeled diagram for the correction of the defect in the above case.
Differentiate between:
Myopia and Hypermetropia.
Explain the Term: Presbyopia
Explain the Term: Cataract
Assertion: Concave mirrors are used as reflectors in torches, vehicle head lights and in search lights.
Reason: When an object is placed beyond the center of curvature of a concave mirror, the image formed is real and inverted.
