A student sitting at the back bench in a class has difficulty in reading. What could be his defect of vision? Draw ray
diagrams to illustrate the image formation of the blackboard when he is seated at the (i) back seat (ii) front seat. State
two possible causes of this defect. Explain the method of correcting this defect with the help of a ray diagram
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Answers
[̲̅h̲̅][̲̅e̲̅][̲̅l̲̅][̲̅l̲̅][̲̅o̲̅] [̲̅b̲̅][̲̅h̲̅][̲̅a̲̅][̲̅i̲̅]
The student is suffering from myopia.
Myopia: It is the defect of the eye because of which distant objects cannot be seen clearly. Image is formed in front of the retina. It is also called Nearsightedness.
Cause: This defect of vision occurs when the eyeball slightly elongates from front to back. This causes light rays to focus at a point in front of the retina, rather than directly on its surface.
Remedy: It can be corrected by an appropriate concave lens.
[̲̅h̲̅][̲̅o̲̅][̲̅p̲̅][̲̅e̲̅] [̲̅t̲̅][̲̅h̲̅][̲̅i̲̅][̲̅s̲̅] [̲̅h̲̅][̲̅e̲̅][̲̅l̲̅][̲̅p̲̅][̲̅s̲̅]
.
[̲̅a̲̅][̲̅g̲̅][̲̅a̲̅][̲̅r̲̅] [̲̅g̲̅][̲̅a̲̅][̲̅l̲̅][̲̅t̲̅][̲̅i̲̅] [̲̅h̲̅][̲̅o̲̅] [̲̅t̲̅][̲̅o̲̅][̲̅h̲̅] [̲̅b̲̅][̲̅a̲̅][̲̅t̲̅][̲̅a̲̅] [̲̅d̲̅][̲̅e̲̅][̲̅n̲̅][̲̅a̲̅] [̲̅r̲̅][̲̅e̲̅][̲̅p̲̅][̲̅o̲̅][̲̅r̲̅][̲̅t̲̅] [̲̅n̲̅][̲̅a̲̅] [̲̅k̲̅][̲̅a̲̅][̲̅r̲̅][̲̅n̲̅][̲̅a̲̅]....[̲̅x̲̅][̲̅D̲̅]
HOPE THIS HELPS YOU.
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